diff --git a/wip/274-dev.md b/wip/274-dev.md
new file mode 100644
index 0000000..77b6090
--- /dev/null
+++ b/wip/274-dev.md
@@ -0,0 +1,283 @@
+---
+title: 274 - development notes
+categories:
+  - Songwriting notes
+wiki:
+  publish: false
+---
+
+# 274: personal dev notes
+
+How the point-of-interest candidates were assembled, and the filtered charts themselves.
+For the song page, see [274](274.md).
+
+## Scope: 川端橋 → 右左府
+
+West end **川端橋**, on the 夕張川, where 夕張市 / 由仁町 / 栗山町 very nearly meet.
+East end **右左府** — 変電所, 発電所, and the transmission line 右左府線, all carrying
+the name of a municipality dissolved in 1943. After that the road goes on east.
+
+Everything past 右左府 — 千呂露橋, 大颱橋, the whole of 日勝峠 and the Tokachi descent —
+is out of scope. Full-route material lives in the KB:
+`~/infra/kb/inbox/surreal/md/` — `R8kobetsu-shisetsu-R274.md` (national registers,
+all 268 R274 facilities), `R274-chimei-junjo.md` (place names), `R274-enkatsu-shisetsu.md`
+(facilities), `R274-PoI-kawabata-usappu.md` (this scope, finer).
+
+Distances below are OSM-derived, measured from a datum near 上野幌, **not official KP**
+(official ≈ +14 km, unverified). Structures have no distance — order only, from route01.
+
+### Structures, with kilometre key
+
+Distances are derived, not official. Two independent methods:
+
+- **sequence alignment** — OSM tags each bridge and tunnel as its own way, so each has a
+  position and a geometric length. Aligning that ordered sequence against the register's
+  ordered lengths transfers the positions. 穂高トンネル lands within 9 m.
+- **anchor** — where a bridge is named after the watercourse it crosses, the geometric
+  crossing point gives an independent position. These override the alignment.
+
+Confidence is the length agreement between register and OSM: high ≤12%, medium ≤35%,
+low above that. Low rows are placed by order alone and should be treated as approximate.
+唐沢橋 and 福本沢川橋 have no position at all — at 9.1 m and 3.0 m they are below the
+size OSM splits into separate ways.
+
+| km | Name | Class | Location | Length (m) | Type | Built | Grade | Confidence | Basis |
+|--:|---|---|---|--:|---|--:|:--:|---|---|
+| 38.41 | 川端橋 | bridge | 由仁町 | 255 | PC | 1991 | Ⅰ | medium | sequence alignment |
+| 41.86 | 雨霧橋 | bridge | 栗山町 | 280.7 | Steel | 1974 | Ⅱ | high | sequence alignment |
+| 43.03 | 竜仙橋 | bridge | 由仁町 | 178 | Steel | 1972 | Ⅱ | high | sequence alignment |
+| 44.00 | 草木橋 | bridge | 栗山町 | 24.1 | Steel | 1979 | Ⅲ | high | anchor: 草木舞沢川 crossing |
+| 44.00 | 滝の上こ線橋 | bridge | 夕張市 | 47.6 | Steel | 1975 | Ⅲ | high | sequence alignment |
+| 50.28 | 十三哩橋 | bridge | 夕張市 | 122 | Steel | 1997 | Ⅰ | high | anchor: 十三里信号場 at 49.71; unclaimed 173 m way |
+| 52.11 | 瑞穂橋 | bridge | 夕張市 | 155 | Steel | 1968 |  | high | anchor: 夕張川 crossing |
+| 53.13 | 紅楓橋 | bridge | 夕張市 | 102.5 | Steel | 1958 | Ⅱ | medium | sequence alignment |
+| 53.69 | ポン久留喜橋 | bridge | 夕張市 | 12.7 | PC | 1984 | Ⅰ | high | anchor: ポンクルキ川 crossing |
+| 53.69 | 久留喜橋 | bridge | 夕張市 | 34 | RC | 1962 |  | medium | sequence alignment |
+| 55.41 | 楓橋 | bridge | 夕張市 | 32 | Steel | 1968 | Ⅲ | low | sequence alignment |
+| 55.60 | 桂橋 | bridge | 夕張市 | 48.3 | PC | 1987 | Ⅰ | high | sequence alignment |
+| 56.60 | 千紫橋 | bridge | 夕張市 | 31.4 | PC | 1988 | Ⅰ | low | sequence alignment |
+| 57.25 | 万紅橋 | bridge | 夕張市 | 27.6 | PC | 1988 | Ⅰ | low | sequence alignment |
+| 57.84 | 登川橋 | bridge | 夕張市 | 21 | PC | 1988 | Ⅰ | low | sequence alignment |
+| 58.23 | 花園橋 | bridge | 夕張市 | 58.6 | Steel | 1971 | Ⅱ | high | sequence alignment |
+| 60.29 | 登川トンネル | tunnel | 夕張市 | 348 | Mountain (sheet-pile) | 1978 |  | high | sequence alignment |
+| 62.36 | オマナイ橋 | bridge | むかわ町 | 174.2 | Steel | 1988 | Ⅲ | high | sequence alignment |
+| 62.94 | 桂木橋 | bridge | むかわ町 | 129.6 | Steel | 1986 | Ⅲ | medium | sequence alignment |
+| 64.44 | 大和橋 | bridge | むかわ町 | 16 | PC | 1967 | Ⅲ | low | sequence alignment |
+| 66.69 | 豊進橋 | bridge | むかわ町 | 16 | PC | 1967 | Ⅲ | medium | sequence alignment |
+| 67.48 | 豊里橋 | bridge | むかわ町 | 27 | PC | 1966 | Ⅰ | medium | sequence alignment |
+| 67.60 | 稲豊橋 | bridge | むかわ町 | 27 | PC | 1966 | Ⅰ | low | sequence alignment |
+| 68.63 | 稲里橋 | bridge | むかわ町 | 31 | Steel | 1988 | Ⅱ | low | sequence alignment |
+| 69.48 | 佐主橋 | bridge | むかわ町 | 85 | Steel | 1973 | Ⅲ | medium | sequence alignment |
+| 72.02 | 長和トンネル | tunnel | むかわ町 | 281 | Mountain (sheet-pile) | 1983 |  | high | sequence alignment |
+| 72.29 | 穂別大橋 | bridge | むかわ町 | 506.2 | Steel | 1979 | Ⅲ | high | sequence alignment |
+| 72.90 | 山水橋 | bridge | むかわ町 | 53.5 | Steel | 1979 | Ⅰ | high | sequence alignment |
+| 74.31 | 沼の沢橋 | bridge | むかわ町 | 188 | Steel | 1983 | Ⅲ | high | sequence alignment |
+| 75.28 | 稲里トンネル | tunnel | むかわ町 | 1441 | Other | 1985 | Ⅲ | high | sequence alignment |
+| 76.97 | ペンケ橋 | bridge | むかわ町 | 120.7 | Steel | 1985 | Ⅲ | medium | sequence alignment |
+| 77.05 | オロロップ橋 | bridge | むかわ町 | 205.9 | Steel | 1983 | Ⅱ | high | anchor: オロロップ沢川 crossing |
+| 78.03 | 下福山橋 | bridge | むかわ町 | 129.9 | Steel | 1982 | Ⅰ | medium | sequence alignment |
+| 79.11 | 福山橋 | bridge | むかわ町 | 134.7 | Steel | 1984 | Ⅲ | medium | sequence alignment |
+| 80.24 | 福山大橋 | bridge | むかわ町 | 160 | PC | 1968 | Ⅲ | high | anchor: 鵡川 crossing |
+| 85.40 | 千坂橋 | bridge | むかわ町 | 138.7 | Steel | 1975 | Ⅱ | medium | sequence alignment |
+| 85.87 | オコタン橋 | bridge | むかわ町 | 338 | Steel | 1985 | Ⅰ | high | sequence alignment |
+| 86.16 | モトツ橋 | bridge | むかわ町 | 62 | Steel | 1988 | Ⅱ | high | anchor: パンケモトツ沢川 crossing |
+| 86.24 | モトツトンネル | tunnel | むかわ町 | 924 | Mountain (NATM) | 1991 | Ⅱ | high | sequence alignment |
+| 87.12 | モトツシェルター | shed | むかわ町 | 62 |  | 1990 | Ⅲ | low | sequence alignment |
+| 87.21 | 福山トンネル | tunnel | むかわ町 | 839 | Mountain (NATM) | 1991 |  | high | sequence alignment |
+| 88.04 | 福穂橋 | bridge | むかわ町 | 210 | Steel | 1990 | Ⅰ | high | sequence alignment |
+| 88.25 | 穂高トンネル | tunnel | むかわ町 | 1991 | Mountain (NATM) | 1991 | Ⅱ | high | sequence alignment |
+| 90.58 | 穂高橋 | bridge | 占冠村 | 140.6 | Steel | 1988 | Ⅱ | high | sequence alignment |
+| 90.90 | 高翠橋 | bridge | 占冠村 | 114 | Steel | 1988 | Ⅰ | high | sequence alignment |
+| 91.14 | 占翠橋 | bridge | 占冠村 | 167 | Steel | 1989 | Ⅰ | high | sequence alignment |
+| 93.67 | 名石橋 | bridge | 占冠村 | 39.6 | Steel | 1970 | Ⅰ | low | sequence alignment |
+| 94.35 | 赤岩大橋 | bridge | 占冠村 | 157.4 | Steel | 1970 | Ⅱ | high | sequence alignment |
+| 95.37 | 渓流大橋 | bridge | 占冠村 | 153.7 | Steel | 1974 | Ⅲ | high | sequence alignment |
+| 96.43 | 日高トンネル | tunnel | 占冠村 | 730 | Mountain (sheet-pile) | 1972 | Ⅲ | high | sequence alignment |
+| 100.60 | 日夕橋 | bridge | 日高町 | 30 | Steel | 1968 | Ⅰ | high | anchor: パンケウシャップ川 crossing; route01 order |
+| 103.12 | 新川橋 | bridge | 日高町 | 3.6 | RC | 1993 | Ⅰ | high | anchor: 新川 crossing |
+| — | 唐沢橋 | bridge | 日高町 | 9.1 | PC | 2004 | Ⅱ | none | sequence alignment |
+| — | 福本沢川橋 | bridge | 日高町 | 3 | RC | 1993 | Ⅰ | none | sequence alignment |
+
+### Watercourses the road meets
+
+Deduplicated to one row per name — the earlier count of 176 was the same rivers split
+across many OSM ways. Offset is closest approach: under ~30 m means the road crosses it.
+
+| km | Offset (m) | Watercourse |
+|--:|--:|---|
+| 37.38 | 171 | ベリベツ川 |
+| 40.90 | 49 | 砂金川 |
+| 43.64 | 15 | 草木川 |
+| 44.00 | 21 | 草木舞沢川 |
+| 45.19 | 7 | カミの沢川 |
+| 48.18 | 63 | チョポツナイ川 |
+| 50.28 | 132 | カライケの沢川 |
+| 52.11 | 16 | 夕張川 |
+| 53.69 | 16 | ポンクルキ川 |
+| 55.14 | 143 | シイタルキ川 |
+| 58.26 | 9 | ホルカクルキ川 |
+| 58.56 | 52 | 滝沢川 |
+| 59.54 | 58 | 松竹沢川 |
+| 62.46 | 6 | サヌシュッペ川 |
+| 66.86 | 157 | 石山の沢川 |
+| 70.22 | 32 | 穂別川 |
+| 72.93 | 9 | 高西の沢川 |
+| 77.05 | 15 | オロロップ沢川 |
+| 80.24 | 53 | 鵡川 |
+| 86.16 | 3 | パンケモトツ沢川 |
+| 88.04 | 26 | ペンケモトツ沢川 |
+| 93.73 | 30 | ニセイパオマナイ川 |
+| 95.37 | 44 | 一の沢川 |
+| 99.93 | 145 | 右の沢川 |
+| 99.98 | 79 | ホロカワウシャップ川 |
+| 100.66 | 21 | パンケウシャップ川 |
+| 103.12 | 26 | 新川 |
+| 104.39 | 15 | ペンケウシャップ川 |
+| 105.99 | 181 | パンケユウケシュオマナイ川 |
+| 106.47 | 52 | オワイタカ沢川 |
+| 107.29 | 13 | 滝の沢川 |
+| 107.95 | 153 | ルウケシオマナイ川 |
+
+### PoI, in road order
+
+| km | Offset (m) | Kind | Name |
+|--:|--:|---|---|
+| 37.27 | 32 | place (neighbourhood) | 川端 |
+| 37.27 | 67 | railway station | 川端 |
+| 37.58 | 1042 | fuel | ENEOS |
+| 39.76 | 357 | power line | 川端線 |
+| 39.80 | 451 | power station | 北海道企業局 川端発電所 |
+| 39.80 | 523 | dam | 川端ダム |
+| 40.57 | 400 | place (locality) | 滝ノ下信号場 |
+| 41.02 | 75 | power line | 滝下川端連絡線 |
+| 41.02 | 1798 | dam | クオーベツダム |
+| 43.21 | 151 | power line | 滝下川端連絡線;滝下線 |
+| 43.30 | 1636 | place (neighbourhood) | 滝下 |
+| 44.62 | 69 | park | 滝の上公園 |
+| 44.62 | 142 | power station | 北海道企業局　滝の上発電所 |
+| 45.06 | 130 | Buddhist temple | 髙峰寺 |
+| 45.29 | 100 | Shinto shrine | 滝ノ上神社 |
+| 47.66 | 52 | place (neighbourhood) | 滝ノ上 |
+| 49.71 | 39 | place (locality) | 十三里信号場 |
+| 52.35 | 151 | Buddhist temple | 一乗寺 |
+| 52.47 | 73 | convenience store | セブン-イレブン |
+| 52.54 | 21 | fuel | ENEOS |
+| 52.54 | 55 | community hall | 紅葉山会館 |
+| 52.54 | 173 | railway station | 新夕張 |
+| 52.57 | 8 | information | 道の駅 夕張メロード |
+| 52.57 | 26 | food & drink | 栗下食堂 |
+| 52.57 | 233 | Buddhist temple | 法園寺 |
+| 52.61 | 18 | shop | すみれ美容室 |
+| 52.61 | 54 | post office | 紅葉山郵便局 |
+| 52.73 | 57 | food & drink | メイプルタウン |
+| 52.85 | 67 | Shinto shrine | 紅葉山神社 |
+| 52.99 | 31 | convenience store | セイコーマート |
+| 53.01 | 108 | fuel | ENEOS |
+| 53.01 | 533 | bridge (structure) | 紅葉山橋 |
+| 56.23 | 148 | Buddhist temple | 錦楓寺 |
+| 56.88 | 711 | place (neighbourhood) | 楓 |
+| 57.84 | 21 | post office | 登川郵便局 |
+| 59.66 | 1208 | place (neighbourhood) | 登川 |
+| 66.83 | 66 | campsite | 穂別キャンプ場 |
+| 67.05 | 414 | power line | 狩勝幹線 |
+| 69.29 | 132 | parking | 樹海温泉;はくあ |
+| 69.29 | 161 | post office | 稲里簡易郵便局 |
+| 71.90 | 166 | dam | 穂別ダム |
+| 79.81 | 71 | gate | 福山第1ゲート |
+| 79.86 | 47 | gate | 福山第2ゲート |
+| 80.01 | 172 | place (neighbourhood) | 穂別福山 |
+| 100.90 | 373 | place (neighbourhood) | 日高 |
+| 102.18 | 13 | place (neighbourhood) | 新町三丁目 |
+| 102.38 | 348 | place (neighbourhood) | 宮下町三丁目 |
+| 102.49 | 58 | shop | セイコーマート |
+| 102.53 | 280 | place (neighbourhood) | 新町二丁目 |
+| 102.53 | 631 | school | 日高中学校 |
+| 102.68 | 146 | place (neighbourhood) | 宮下町二丁目 |
+| 102.72 | 12 | bus stop | 日高 |
+| 102.72 | 42 | shop | kanamoto |
+| 102.72 | 108 | place (neighbourhood) | 新町一丁目 |
+| 102.80 | 5 | bus stop | 日高 |
+| 102.80 | 53 | community hall | 日高こもれびホール |
+| 102.80 | 198 | place (neighbourhood) | 宮下町一丁目 |
+| 102.86 | 1045 | bus stop | 西一線第一 |
+| 102.90 | 38 | fuel | ホクレンSS |
+| 102.90 | 1054 | bus stop | 西一線第一 |
+| 102.99 | 71 | place (neighbourhood) | 栄町西一丁目 |
+| 102.99 | 108 | place (neighbourhood) | 栄町東一丁目 |
+| 102.99 | 315 | place (neighbourhood) | 栄町東二丁目 |
+| 102.99 | 441 | place (neighbourhood) | 栄町西二丁目 |
+| 103.03 | 31 | shop | 福士理容院 |
+| 103.03 | 43 | fire station | 日高西部消防組合消防署 |
+| 103.14 | 164 | place (neighbourhood) | 本町西三丁目 |
+| 103.20 | 37 | bus stop | 日高ターミナル |
+| 103.20 | 79 | town hall | 日高町役場 |
+| 103.20 | 188 | place (neighbourhood) | 本町東三丁目 |
+| 103.22 | 37 | lodging | ホテル日勝 |
+| 103.22 | 133 | museum | 日高町立日高図書館郷土資料館 |
+| 103.22 | 180 | community hall | 日高町老人福祉センター |
+| 103.22 | 189 | place (neighbourhood) | 本町西二丁目 |
+| 103.29 | 85 | post office | 日高郵便局 |
+| 103.29 | 85 | convenience store | セイコーマート |
+| 103.30 | 69 | place (neighbourhood) | 本町東一丁目 |
+| 103.30 | 680 | place (neighbourhood) | 若葉町一丁目 |
+| 103.39 | 25 | lodging | 松屋旅館 |
+| 103.39 | 43 | food & drink | 寿司日本橋 |
+| 103.39 | 92 | place (neighbourhood) | 本町西一丁目 |
+| 103.39 | 385 | community hall | 若葉町会館 |
+| 103.41 | 117 | place (neighbourhood) | 若葉町二丁目 |
+| 103.41 | 690 | campsite | 日高沙流川オートキャンプ場 |
+| 103.41 | 725 | historic site | 79616 |
+| 103.41 | 773 | lodging | 沙流川温泉 ひだか高原荘 |
+| 103.43 | 24 | food & drink | そば処夏川 |
+| 103.46 | 40 | food & drink | 和風レストランふじかみ |
+| 103.46 | 408 | campsite | 国立日高青少年自然の家からまつキャンプ場 |
+| 103.47 | 57 | shop | エーコープ |
+| 103.66 | 56 | community hall | 本町東会館 |
+| 103.66 | 138 | place (neighbourhood) | 本町東二丁目 |
+| 103.88 | 200 | school | 日高小学校 |
+| 103.94 | 162 | place (neighbourhood) | 松風町一丁目 |
+| 104.00 | 189 | place (neighbourhood) | 松風町二丁目 |
+| 104.02 | 57 | school | 日高高校 |
+| 104.08 | 652 | place (neighbourhood) | 山手町二丁目 |
+| 104.23 | 147 | place (neighbourhood) | 山手町一丁目 |
+| 104.52 | 511 | place (neighbourhood) | 山手町三丁目 |
+| 104.52 | 951 | power line | 日高支線 |
+| 106.22 | 245 | substation | 右左府変電所 |
+| 106.84 | 32 | bus stop | 6区吊橋 |
+| 106.84 | 38 | bus stop | 6区吊橋 |
+| 107.95 | 43 | bus stop | 岩石橋入口 |
+| 107.95 | 103 | bus stop | 岩石橋入口 |
+
+### Things worth keeping in the text
+
+- **紅楓橋 1958** is the oldest structure in scope, and the furthest-upstream crossing
+  of the 夕張川. **唐沢橋 2004** is the newest.
+- Eight bridges date from **1988**, three tunnels from **1991** — the new-built
+  紅葉山–穂高 section going in. That section had no predecessor road at all.
+- **穂高トンネル is 1,991 m long and was built in 1991.** The two numbers are identical
+  and the national register's own column order makes them easy to confuse.
+- **モトツシェルター (62 m, 1990) and モトツ橋 (62 m, 1988)** — same length, same name,
+  two years apart.
+- **福山第1ゲート 79.81 km, 福山第2ゲート 79.86 km** — the closure gates, 50 m apart.
+- **21 km of nothing** between 穂別福山 (80.01) and 日高 (100.90): no named facility,
+  no PoI, no settlement within 2 km. That is ニニウ and the 樹海.
+- The 滝下/滝の上 cluster carries the の/ノ split: 滝の上発電所 and 滝の上公園 against
+  滝ノ上神社 and the district 滝ノ上. The register writes 滝の上こ線橋.
+- **十三哩橋** in the register, **十三里橋** on the sign, **とみさと** on the map.
+  13 miles from 追分, via 里, into a hamlet name.
+- 夕張市街 is **17 km** from 紅葉山交差点. That is how far the road misses the town by.
+- JR石勝線 runs alongside here under **many スノーシェッド**. R274 has none.
+- 道道1065号夕張厚真線 is severed at the 夕張/厚真 boundary and the plan to finish it
+  has been cancelled.
+- Overhead at 紅葉山: **夕張のぞみ橋, 夕張きぼう橋, 夕張みらい橋** — three E38 bridges
+  named Hope, Wish and Future crossing a road whose own bridges carry river names.
+
+### Flags
+
+- 右左府発電所 is not in OpenStreetMap; only 右左府変電所 and the line 右左府線.
+  Coordinates need manual confirmation.
+- 交差点 names have no open database — OSM has 7 named nodes on all 388 km. Junction
+  names in scope come from ja.wikipedia and route01 only.
+- 唐沢橋 and 福本沢川橋 are in 日高町 but their position relative to 右左府 is unconfirmed.
+- Distances are not official KP. One kilopost read on Street View would fix the offset.
+- A 史跡 at 103.41 km appears in OSM with the name `79616` — an import artefact, not a name.
diff --git a/wip/274.md b/wip/274.md
index 7a9092d..242b996 100644
--- a/wip/274.md
+++ b/wip/274.md
@@ -29,273 +29,5 @@ Codename `Yuubari 2` but I've decided that this will be more about Route 274. Th
 
 ```
 
-## Scope: 川端橋 → 右左府
-
-West end **川端橋**, on the 夕張川, where 夕張市 / 由仁町 / 栗山町 very nearly meet.
-East end **右左府** — 変電所, 発電所, and the transmission line 右左府線, all carrying
-the name of a municipality dissolved in 1943. After that the road goes on east.
-
-Everything past 右左府 — 千呂露橋, 大颱橋, the whole of 日勝峠 and the Tokachi descent —
-is out of scope. Full-route material lives in the KB:
-`~/infra/kb/inbox/surreal/md/` — `R8kobetsu-shisetsu-R274.md` (national registers,
-all 268 R274 facilities), `R274-chimei-junjo.md` (place names), `R274-enkatsu-shisetsu.md`
-(facilities), `R274-PoI-kawabata-usappu.md` (this scope, finer).
-
-Distances below are OSM-derived, measured from a datum near 上野幌, **not official KP**
-(official ≈ +14 km, unverified). Structures have no distance — order only, from route01.
-
-### Structures, with kilometre key
-
-Distances are derived, not official. Two independent methods:
-
-- **sequence alignment** — OSM tags each bridge and tunnel as its own way, so each has a
-  position and a geometric length. Aligning that ordered sequence against the register's
-  ordered lengths transfers the positions. 穂高トンネル lands within 9 m.
-- **anchor** — where a bridge is named after the watercourse it crosses, the geometric
-  crossing point gives an independent position. These override the alignment.
-
-Confidence is the length agreement between register and OSM: high ≤12%, medium ≤35%,
-low above that. Low rows are placed by order alone and should be treated as approximate.
-唐沢橋 and 福本沢川橋 have no position at all — at 9.1 m and 3.0 m they are below the
-size OSM splits into separate ways.
-
-| km | Name | Class | Location | Length (m) | Type | Built | Grade | Confidence | Basis |
-|--:|---|---|---|--:|---|--:|:--:|---|---|
-| 38.41 | 川端橋 | bridge | 由仁町 | 255 | PC | 1991 | Ⅰ | medium | sequence alignment |
-| 41.86 | 雨霧橋 | bridge | 栗山町 | 280.7 | Steel | 1974 | Ⅱ | high | sequence alignment |
-| 43.03 | 竜仙橋 | bridge | 由仁町 | 178 | Steel | 1972 | Ⅱ | high | sequence alignment |
-| 44.00 | 草木橋 | bridge | 栗山町 | 24.1 | Steel | 1979 | Ⅲ | high | anchor: 草木舞沢川 crossing |
-| 44.00 | 滝の上こ線橋 | bridge | 夕張市 | 47.6 | Steel | 1975 | Ⅲ | high | sequence alignment |
-| 50.28 | 十三哩橋 | bridge | 夕張市 | 122 | Steel | 1997 | Ⅰ | high | anchor: 十三里信号場 at 49.71; unclaimed 173 m way |
-| 52.11 | 瑞穂橋 | bridge | 夕張市 | 155 | Steel | 1968 |  | high | anchor: 夕張川 crossing |
-| 53.13 | 紅楓橋 | bridge | 夕張市 | 102.5 | Steel | 1958 | Ⅱ | medium | sequence alignment |
-| 53.69 | ポン久留喜橋 | bridge | 夕張市 | 12.7 | PC | 1984 | Ⅰ | high | anchor: ポンクルキ川 crossing |
-| 53.69 | 久留喜橋 | bridge | 夕張市 | 34 | RC | 1962 |  | medium | sequence alignment |
-| 55.41 | 楓橋 | bridge | 夕張市 | 32 | Steel | 1968 | Ⅲ | low | sequence alignment |
-| 55.60 | 桂橋 | bridge | 夕張市 | 48.3 | PC | 1987 | Ⅰ | high | sequence alignment |
-| 56.60 | 千紫橋 | bridge | 夕張市 | 31.4 | PC | 1988 | Ⅰ | low | sequence alignment |
-| 57.25 | 万紅橋 | bridge | 夕張市 | 27.6 | PC | 1988 | Ⅰ | low | sequence alignment |
-| 57.84 | 登川橋 | bridge | 夕張市 | 21 | PC | 1988 | Ⅰ | low | sequence alignment |
-| 58.23 | 花園橋 | bridge | 夕張市 | 58.6 | Steel | 1971 | Ⅱ | high | sequence alignment |
-| 60.29 | 登川トンネル | tunnel | 夕張市 | 348 | Mountain (sheet-pile) | 1978 |  | high | sequence alignment |
-| 62.36 | オマナイ橋 | bridge | むかわ町 | 174.2 | Steel | 1988 | Ⅲ | high | sequence alignment |
-| 62.94 | 桂木橋 | bridge | むかわ町 | 129.6 | Steel | 1986 | Ⅲ | medium | sequence alignment |
-| 64.44 | 大和橋 | bridge | むかわ町 | 16 | PC | 1967 | Ⅲ | low | sequence alignment |
-| 66.69 | 豊進橋 | bridge | むかわ町 | 16 | PC | 1967 | Ⅲ | medium | sequence alignment |
-| 67.48 | 豊里橋 | bridge | むかわ町 | 27 | PC | 1966 | Ⅰ | medium | sequence alignment |
-| 67.60 | 稲豊橋 | bridge | むかわ町 | 27 | PC | 1966 | Ⅰ | low | sequence alignment |
-| 68.63 | 稲里橋 | bridge | むかわ町 | 31 | Steel | 1988 | Ⅱ | low | sequence alignment |
-| 69.48 | 佐主橋 | bridge | むかわ町 | 85 | Steel | 1973 | Ⅲ | medium | sequence alignment |
-| 72.02 | 長和トンネル | tunnel | むかわ町 | 281 | Mountain (sheet-pile) | 1983 |  | high | sequence alignment |
-| 72.29 | 穂別大橋 | bridge | むかわ町 | 506.2 | Steel | 1979 | Ⅲ | high | sequence alignment |
-| 72.90 | 山水橋 | bridge | むかわ町 | 53.5 | Steel | 1979 | Ⅰ | high | sequence alignment |
-| 74.31 | 沼の沢橋 | bridge | むかわ町 | 188 | Steel | 1983 | Ⅲ | high | sequence alignment |
-| 75.28 | 稲里トンネル | tunnel | むかわ町 | 1441 | Other | 1985 | Ⅲ | high | sequence alignment |
-| 76.97 | ペンケ橋 | bridge | むかわ町 | 120.7 | Steel | 1985 | Ⅲ | medium | sequence alignment |
-| 77.05 | オロロップ橋 | bridge | むかわ町 | 205.9 | Steel | 1983 | Ⅱ | high | anchor: オロロップ沢川 crossing |
-| 78.03 | 下福山橋 | bridge | むかわ町 | 129.9 | Steel | 1982 | Ⅰ | medium | sequence alignment |
-| 79.11 | 福山橋 | bridge | むかわ町 | 134.7 | Steel | 1984 | Ⅲ | medium | sequence alignment |
-| 80.24 | 福山大橋 | bridge | むかわ町 | 160 | PC | 1968 | Ⅲ | high | anchor: 鵡川 crossing |
-| 85.40 | 千坂橋 | bridge | むかわ町 | 138.7 | Steel | 1975 | Ⅱ | medium | sequence alignment |
-| 85.87 | オコタン橋 | bridge | むかわ町 | 338 | Steel | 1985 | Ⅰ | high | sequence alignment |
-| 86.16 | モトツ橋 | bridge | むかわ町 | 62 | Steel | 1988 | Ⅱ | high | anchor: パンケモトツ沢川 crossing |
-| 86.24 | モトツトンネル | tunnel | むかわ町 | 924 | Mountain (NATM) | 1991 | Ⅱ | high | sequence alignment |
-| 87.12 | モトツシェルター | shed | むかわ町 | 62 |  | 1990 | Ⅲ | low | sequence alignment |
-| 87.21 | 福山トンネル | tunnel | むかわ町 | 839 | Mountain (NATM) | 1991 |  | high | sequence alignment |
-| 88.04 | 福穂橋 | bridge | むかわ町 | 210 | Steel | 1990 | Ⅰ | high | sequence alignment |
-| 88.25 | 穂高トンネル | tunnel | むかわ町 | 1991 | Mountain (NATM) | 1991 | Ⅱ | high | sequence alignment |
-| 90.58 | 穂高橋 | bridge | 占冠村 | 140.6 | Steel | 1988 | Ⅱ | high | sequence alignment |
-| 90.90 | 高翠橋 | bridge | 占冠村 | 114 | Steel | 1988 | Ⅰ | high | sequence alignment |
-| 91.14 | 占翠橋 | bridge | 占冠村 | 167 | Steel | 1989 | Ⅰ | high | sequence alignment |
-| 93.67 | 名石橋 | bridge | 占冠村 | 39.6 | Steel | 1970 | Ⅰ | low | sequence alignment |
-| 94.35 | 赤岩大橋 | bridge | 占冠村 | 157.4 | Steel | 1970 | Ⅱ | high | sequence alignment |
-| 95.37 | 渓流大橋 | bridge | 占冠村 | 153.7 | Steel | 1974 | Ⅲ | high | sequence alignment |
-| 96.43 | 日高トンネル | tunnel | 占冠村 | 730 | Mountain (sheet-pile) | 1972 | Ⅲ | high | sequence alignment |
-| 100.60 | 日夕橋 | bridge | 日高町 | 30 | Steel | 1968 | Ⅰ | high | anchor: パンケウシャップ川 crossing; route01 order |
-| 103.12 | 新川橋 | bridge | 日高町 | 3.6 | RC | 1993 | Ⅰ | high | anchor: 新川 crossing |
-| — | 唐沢橋 | bridge | 日高町 | 9.1 | PC | 2004 | Ⅱ | none | sequence alignment |
-| — | 福本沢川橋 | bridge | 日高町 | 3 | RC | 1993 | Ⅰ | none | sequence alignment |
-
-### Watercourses the road meets
-
-Deduplicated to one row per name — the earlier count of 176 was the same rivers split
-across many OSM ways. Offset is closest approach: under ~30 m means the road crosses it.
-
-| km | Offset (m) | Watercourse |
-|--:|--:|---|
-| 37.38 | 171 | ベリベツ川 |
-| 40.90 | 49 | 砂金川 |
-| 43.64 | 15 | 草木川 |
-| 44.00 | 21 | 草木舞沢川 |
-| 45.19 | 7 | カミの沢川 |
-| 48.18 | 63 | チョポツナイ川 |
-| 50.28 | 132 | カライケの沢川 |
-| 52.11 | 16 | 夕張川 |
-| 53.69 | 16 | ポンクルキ川 |
-| 55.14 | 143 | シイタルキ川 |
-| 58.26 | 9 | ホルカクルキ川 |
-| 58.56 | 52 | 滝沢川 |
-| 59.54 | 58 | 松竹沢川 |
-| 62.46 | 6 | サヌシュッペ川 |
-| 66.86 | 157 | 石山の沢川 |
-| 70.22 | 32 | 穂別川 |
-| 72.93 | 9 | 高西の沢川 |
-| 77.05 | 15 | オロロップ沢川 |
-| 80.24 | 53 | 鵡川 |
-| 86.16 | 3 | パンケモトツ沢川 |
-| 88.04 | 26 | ペンケモトツ沢川 |
-| 93.73 | 30 | ニセイパオマナイ川 |
-| 95.37 | 44 | 一の沢川 |
-| 99.93 | 145 | 右の沢川 |
-| 99.98 | 79 | ホロカワウシャップ川 |
-| 100.66 | 21 | パンケウシャップ川 |
-| 103.12 | 26 | 新川 |
-| 104.39 | 15 | ペンケウシャップ川 |
-| 105.99 | 181 | パンケユウケシュオマナイ川 |
-| 106.47 | 52 | オワイタカ沢川 |
-| 107.29 | 13 | 滝の沢川 |
-| 107.95 | 153 | ルウケシオマナイ川 |
-
-### PoI, in road order
-
-| km | Offset (m) | Kind | Name |
-|--:|--:|---|---|
-| 37.27 | 32 | place (neighbourhood) | 川端 |
-| 37.27 | 67 | railway station | 川端 |
-| 37.58 | 1042 | fuel | ENEOS |
-| 39.76 | 357 | power line | 川端線 |
-| 39.80 | 451 | power station | 北海道企業局 川端発電所 |
-| 39.80 | 523 | dam | 川端ダム |
-| 40.57 | 400 | place (locality) | 滝ノ下信号場 |
-| 41.02 | 75 | power line | 滝下川端連絡線 |
-| 41.02 | 1798 | dam | クオーベツダム |
-| 43.21 | 151 | power line | 滝下川端連絡線;滝下線 |
-| 43.30 | 1636 | place (neighbourhood) | 滝下 |
-| 44.62 | 69 | park | 滝の上公園 |
-| 44.62 | 142 | power station | 北海道企業局　滝の上発電所 |
-| 45.06 | 130 | Buddhist temple | 髙峰寺 |
-| 45.29 | 100 | Shinto shrine | 滝ノ上神社 |
-| 47.66 | 52 | place (neighbourhood) | 滝ノ上 |
-| 49.71 | 39 | place (locality) | 十三里信号場 |
-| 52.35 | 151 | Buddhist temple | 一乗寺 |
-| 52.47 | 73 | convenience store | セブン-イレブン |
-| 52.54 | 21 | fuel | ENEOS |
-| 52.54 | 55 | community hall | 紅葉山会館 |
-| 52.54 | 173 | railway station | 新夕張 |
-| 52.57 | 8 | information | 道の駅 夕張メロード |
-| 52.57 | 26 | food & drink | 栗下食堂 |
-| 52.57 | 233 | Buddhist temple | 法園寺 |
-| 52.61 | 18 | shop | すみれ美容室 |
-| 52.61 | 54 | post office | 紅葉山郵便局 |
-| 52.73 | 57 | food & drink | メイプルタウン |
-| 52.85 | 67 | Shinto shrine | 紅葉山神社 |
-| 52.99 | 31 | convenience store | セイコーマート |
-| 53.01 | 108 | fuel | ENEOS |
-| 53.01 | 533 | bridge (structure) | 紅葉山橋 |
-| 56.23 | 148 | Buddhist temple | 錦楓寺 |
-| 56.88 | 711 | place (neighbourhood) | 楓 |
-| 57.84 | 21 | post office | 登川郵便局 |
-| 59.66 | 1208 | place (neighbourhood) | 登川 |
-| 66.83 | 66 | campsite | 穂別キャンプ場 |
-| 67.05 | 414 | power line | 狩勝幹線 |
-| 69.29 | 132 | parking | 樹海温泉;はくあ |
-| 69.29 | 161 | post office | 稲里簡易郵便局 |
-| 71.90 | 166 | dam | 穂別ダム |
-| 79.81 | 71 | gate | 福山第1ゲート |
-| 79.86 | 47 | gate | 福山第2ゲート |
-| 80.01 | 172 | place (neighbourhood) | 穂別福山 |
-| 100.90 | 373 | place (neighbourhood) | 日高 |
-| 102.18 | 13 | place (neighbourhood) | 新町三丁目 |
-| 102.38 | 348 | place (neighbourhood) | 宮下町三丁目 |
-| 102.49 | 58 | shop | セイコーマート |
-| 102.53 | 280 | place (neighbourhood) | 新町二丁目 |
-| 102.53 | 631 | school | 日高中学校 |
-| 102.68 | 146 | place (neighbourhood) | 宮下町二丁目 |
-| 102.72 | 12 | bus stop | 日高 |
-| 102.72 | 42 | shop | kanamoto |
-| 102.72 | 108 | place (neighbourhood) | 新町一丁目 |
-| 102.80 | 5 | bus stop | 日高 |
-| 102.80 | 53 | community hall | 日高こもれびホール |
-| 102.80 | 198 | place (neighbourhood) | 宮下町一丁目 |
-| 102.86 | 1045 | bus stop | 西一線第一 |
-| 102.90 | 38 | fuel | ホクレンSS |
-| 102.90 | 1054 | bus stop | 西一線第一 |
-| 102.99 | 71 | place (neighbourhood) | 栄町西一丁目 |
-| 102.99 | 108 | place (neighbourhood) | 栄町東一丁目 |
-| 102.99 | 315 | place (neighbourhood) | 栄町東二丁目 |
-| 102.99 | 441 | place (neighbourhood) | 栄町西二丁目 |
-| 103.03 | 31 | shop | 福士理容院 |
-| 103.03 | 43 | fire station | 日高西部消防組合消防署 |
-| 103.14 | 164 | place (neighbourhood) | 本町西三丁目 |
-| 103.20 | 37 | bus stop | 日高ターミナル |
-| 103.20 | 79 | town hall | 日高町役場 |
-| 103.20 | 188 | place (neighbourhood) | 本町東三丁目 |
-| 103.22 | 37 | lodging | ホテル日勝 |
-| 103.22 | 133 | museum | 日高町立日高図書館郷土資料館 |
-| 103.22 | 180 | community hall | 日高町老人福祉センター |
-| 103.22 | 189 | place (neighbourhood) | 本町西二丁目 |
-| 103.29 | 85 | post office | 日高郵便局 |
-| 103.29 | 85 | convenience store | セイコーマート |
-| 103.30 | 69 | place (neighbourhood) | 本町東一丁目 |
-| 103.30 | 680 | place (neighbourhood) | 若葉町一丁目 |
-| 103.39 | 25 | lodging | 松屋旅館 |
-| 103.39 | 43 | food & drink | 寿司日本橋 |
-| 103.39 | 92 | place (neighbourhood) | 本町西一丁目 |
-| 103.39 | 385 | community hall | 若葉町会館 |
-| 103.41 | 117 | place (neighbourhood) | 若葉町二丁目 |
-| 103.41 | 690 | campsite | 日高沙流川オートキャンプ場 |
-| 103.41 | 725 | historic site | 79616 |
-| 103.41 | 773 | lodging | 沙流川温泉 ひだか高原荘 |
-| 103.43 | 24 | food & drink | そば処夏川 |
-| 103.46 | 40 | food & drink | 和風レストランふじかみ |
-| 103.46 | 408 | campsite | 国立日高青少年自然の家からまつキャンプ場 |
-| 103.47 | 57 | shop | エーコープ |
-| 103.66 | 56 | community hall | 本町東会館 |
-| 103.66 | 138 | place (neighbourhood) | 本町東二丁目 |
-| 103.88 | 200 | school | 日高小学校 |
-| 103.94 | 162 | place (neighbourhood) | 松風町一丁目 |
-| 104.00 | 189 | place (neighbourhood) | 松風町二丁目 |
-| 104.02 | 57 | school | 日高高校 |
-| 104.08 | 652 | place (neighbourhood) | 山手町二丁目 |
-| 104.23 | 147 | place (neighbourhood) | 山手町一丁目 |
-| 104.52 | 511 | place (neighbourhood) | 山手町三丁目 |
-| 104.52 | 951 | power line | 日高支線 |
-| 106.22 | 245 | substation | 右左府変電所 |
-| 106.84 | 32 | bus stop | 6区吊橋 |
-| 106.84 | 38 | bus stop | 6区吊橋 |
-| 107.95 | 43 | bus stop | 岩石橋入口 |
-| 107.95 | 103 | bus stop | 岩石橋入口 |
-
-### Things worth keeping in the text
-
-- **紅楓橋 1958** is the oldest structure in scope, and the furthest-upstream crossing
-  of the 夕張川. **唐沢橋 2004** is the newest.
-- Eight bridges date from **1988**, three tunnels from **1991** — the new-built
-  紅葉山–穂高 section going in. That section had no predecessor road at all.
-- **穂高トンネル is 1,991 m long and was built in 1991.** The two numbers are identical
-  and the national register's own column order makes them easy to confuse.
-- **モトツシェルター (62 m, 1990) and モトツ橋 (62 m, 1988)** — same length, same name,
-  two years apart.
-- **福山第1ゲート 79.81 km, 福山第2ゲート 79.86 km** — the closure gates, 50 m apart.
-- **21 km of nothing** between 穂別福山 (80.01) and 日高 (100.90): no named facility,
-  no PoI, no settlement within 2 km. That is ニニウ and the 樹海.
-- The 滝下/滝の上 cluster carries the の/ノ split: 滝の上発電所 and 滝の上公園 against
-  滝ノ上神社 and the district 滝ノ上. The register writes 滝の上こ線橋.
-- **十三哩橋** in the register, **十三里橋** on the sign, **とみさと** on the map.
-  13 miles from 追分, via 里, into a hamlet name.
-- 夕張市街 is **17 km** from 紅葉山交差点. That is how far the road misses the town by.
-- JR石勝線 runs alongside here under **many スノーシェッド**. R274 has none.
-- 道道1065号夕張厚真線 is severed at the 夕張/厚真 boundary and the plan to finish it
-  has been cancelled.
-- Overhead at 紅葉山: **夕張のぞみ橋, 夕張きぼう橋, 夕張みらい橋** — three E38 bridges
-  named Hope, Wish and Future crossing a road whose own bridges carry river names.
-
-### Flags
-
-- 右左府発電所 is not in OpenStreetMap; only 右左府変電所 and the line 右左府線.
-  Coordinates need manual confirmation.
-- 交差点 names have no open database — OSM has 7 named nodes on all 388 km. Junction
-  names in scope come from ja.wikipedia and route01 only.
-- 唐沢橋 and 福本沢川橋 are in 日高町 but their position relative to 右左府 is unconfirmed.
-- Distances are not official KP. One kilopost read on Street View would fix the offset.
-- A 史跡 at 103.41 km appears in OSM with the name `79616` — an import artefact, not a name.
+For how the reference material was produced and the feature tables themselves, see
+[274 development notes](274-dev.md).