ncmr-songs/wip/274-dev.md

title, categories, wiki

title	categories	wiki
274 - development notes	Songwriting notes	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.

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

Cross-checked against the 国土数値情報 河川データセット (W05) via the Geoshape repository at 国立情報学研究所 — all 561 named rivers of the 石狩川, 鵡川 and 沙流川 systems, since named rivers each carry their own 河川コード and are not in the 「その他」 group. The sweep found 34 names; three were dropped by the author (below), leaving 31. Of those, 30 appear in both W05 and OpenStreetMap, and all but one agree on position to within 110 m.

Offset is closest approach; under ~30 m means the road crosses it.

km	Offset (m)	Watercourse	Water system	Source
41.02	58	砂金川	石狩川水系	both
43.64	84	草木川	石狩川水系	both
44.00	21	草木舞沢川	石狩川水系	both
45.21	40	カミの沢川	石狩川水系	both
48.18	63	チョポツナイ川	石狩川水系	both
50.28	132	カライケの沢川	石狩川水系	both
52.11	16	夕張川	石狩川水系	both
53.69	16	ポンクルキ川	石狩川水系	both
55.14	143	シイタルキ川	石狩川水系	both
58.26	9	ホルカクルキ川	石狩川水系	both
58.56	52	滝沢川	石狩川水系	both
59.54	58	松竹沢川	石狩川水系	both
66.86	161	石山の沢川	鵡川水系	both
67.62	5	サヌシュッペ川	鵡川水系	both
70.22	32	穂別川	鵡川水系	both
72.93	9	高西の沢川	鵡川水系	both
77.05	15	オロロップ沢川	鵡川水系	both
80.24	68	鵡川	鵡川水系	both
86.16	10	パンケモトツ沢川	鵡川水系	both
88.04	26	ペンケモトツ沢川	鵡川水系	both
93.73	30	ニセイパオマナイ川	鵡川水系	both
95.37	44	一の沢川	鵡川水系	both
99.93	145	右の沢川	沙流川水系	both
99.98	79	ホロカワウシャップ川	沙流川水系	both
100.66	21	パンケウシャップ川	沙流川水系	both
103.12	23	新川	沙流川水系	both
104.39	15	ペンケウシャップ川	沙流川水系	both
105.99	181	パンケユウケシュオマナイ川	沙流川水系	both
106.47	52	オワイタカ沢川	沙流川水系	both
107.29	18	滝の沢川	沙流川水系	both
107.83	134	ルウケシオマナイ川	沙流川水系	both

Excluded by the author, 2026-09-10:

• 名称不明 (63.02 km) — W05 carries it with no name; dropped.
• ベリベツ川 (37.38 km in OSM, never within 300 m in W05) — mostly converted to farm waterway, and it sits marginally west of 川端橋, outside the range.
• デチン沢川 (102.90 km, 沙流川水系, 河川コード 8101070000) — too thin to carry a line.

サヌシュッペ川 is not a disagreement: it runs beside the road rather than crossing it, so each dataset is tangent at a different reach (62.46 / 67.62). The crossing is at 大和橋, around 64.4 km. Any parallel watercourse behaves this way.

ホルカクルキ川 at 58.26 km is confirmed three ways and agrees to the metre: OSM, W05 (河川コード 8101030169), and the 北海道 name plate on the bank, which reads 一級河川石狩川水系 ホルカクルキ川 and gives the Ainu original as ホロカ・クルヒ (horka・kurihi) — horka "to turn back", kurihi "its shadow". In Ainu river naming horka marks a stream running counter to its parent river, so the name records a hydrological fact. The same element appears on ホロカユウパロ川 elsewhere in the 石狩川 system — the Ainu form behind 夕張. route01's ホロカクルキ川 is a slip: the writer applied the Ainu form to the Japanese name.

This list is a shortlist, not a programme. Most of these are minor streams and are here so they can be picked from, not because each earns a line.

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.