Home › Montana › Lewis and Clark County › All bridges

Every bridge in Lewis and Clark County, Montana

Name: Every bridge in Lewis and Clark County, Montana
Creator: Bridge Report Card
License: https://creativecommons.org/publicdomain/zero/1.0/

204 inventoried bridges, busiest first

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Lewis and Clark County, Montana, has 204 bridges in the 2025 National Bridge Inventory: 118 rated good, 75 fair, and 11 poor (as of August 20, 2026).
This index lists every one of them, busiest first; each links to its own condition record.

Bridge	Built	Vehicles/day	Condition
Lyndale Ave-us 12 over Great Northern Area	2003	20,397	Good
US 12 over RR	1978	19,327	Good
N Last Chance Gulc over RR	2003	18,569	Good
E Custer Ave over Int Custer Ave-i 15	2012	16,988	Good
US 12 over Prickly Pear Creek	1978	15,333	Good
I 15 over Sep Boulder Ave-rr	2016	14,810	Fair
I 15 over Sep Boulder Ave-rr	2017	14,810	Fair
E Custer Ave over Helena Valley Canal	2012	14,653	Good
Cedar St over Int Cedar St-i 15	2002	14,368	Fair
Prospect Ave-us 12 over Int Capitol-i 15	1961	12,054	Fair
Prospect Ave-us 12 over Int Capitol-i 15	1961	12,054	Fair
N Montana Ave over Helena Valley Canal	1958	11,167	Fair
N Montana Ave over Ten Mile Creek	2004	11,167	Good
Canyon Ferry Rd over Prickly Pear Creek	2001	10,503	Good
Lincoln Rd over Int Lincoln-i 15	1962	7,492	Poor
I 15 over Sep Sierra Rd E	1962	6,202	Good
I 15 over Sep Sierra Rd E	1962	6,202	Good
I 15 over Ten Mile Creek	1962	6,202	Good
I 15 over Ten Mile Creek	1962	6,202	Good
York Rd over Prickly Pear Creek	1941	6,170	Fair
Saddle Drive over S Helena Int I 15 156	2007	5,722	Good
Wylie Dr over Helena Valley Canal 081	1958	5,482	Fair
I 15 over Wolf Creek	1966	5,109	Fair
US 12 over Ten Mile Creek	1988	5,018	Good
Lake Helena Dr over Helena Valley Canal 073	2004	4,910	Good
Green Meadow Dr over Ten Mile Creek	1992	4,837	Good
Canyon Ferry Rd over Helena Valley Canal	2009	4,835	Good
I 15 over Little Prickly Pear CR	1965	4,806	Good
Green Meadow Dr over Helena Valley Canal	1992	4,510	Good
Wylie Dr over Prickly Pear Creek 080	1958	4,338	Good
I 15 over Dog Creek	1967	4,290	Fair
I 15 over Rock Creek	1967	4,290	Good
Green Meadow Dr over Helena Valley Canal	2000	4,190	Good
Country Club Ave over Ten Mile Creek 113	2000	3,235	Good
Williams Ave over Ten Mile Creek 003	2010	3,068	Good
Valley Dr over Helena Valley Canal 074	2000	2,914	Good
E Main Street over Prickly Pear Creek 009	1934	2,580	Fair
I 15 over Int Spring Creek-rr	1964	2,555	Fair
I 15 over Int Spring Creek-rr	1964	2,555	Fair
I 15 over Int Wolf Creek	1966	2,555	Good
I 15 over Int Wolf Creek	1966	2,555	Fair
I 15 over Sep Lyons Creek Road	1964	2,555	Good
I 15 over Sep Lyons Creek Road	1964	2,555	Good
I 15 over Int Gates of the Mtns	1962	2,403	Good
I 15 over Int Gates of the Mtns	1962	2,403	Good
I 15 over Int Seiben	1962	2,403	Good
I 15 over Int Seiben	1962	2,403	Good
I 15 over Little Prickly Pear CR	1965	2,403	Fair
I 15 over Little Prickly Pear CR	1965	2,403	Fair
I 15 over Int Craig	1967	2,201	Good
I 15 over Int Craig	1967	2,201	Good
I 15 over Missouri Rvr-rr-local	1971	2,201	Fair
I 15 over Missouri Rvr-rr-local	1971	2,201	Fair
I 15 over RR	1967	2,201	Good
I 15 over RR	1967	2,201	Good
I 15 over Sep Missouri Rvr-co Rd	1967	2,201	Fair
I 15 over Sep Missouri Rvr-co Rd	1967	2,201	Fair
I 15 over Stickney Creek	1968	2,201	Fair
I 15 over Stickney Creek	1968	2,201	Good
S 200 over Beaver Creek	1993	2,140	Good
S 200 over Keep Cool Creek	1993	2,140	Good
S 200 over Landers Fork	1938	2,011	Fair
S 200 over Alice Creek	2014	1,991	Good
S 200 over Wildlife Crossing	2014	1,991	Good
S 200 over Wildlife Crossing	2014	1,991	Good
Green Meadow Dr over Silver Creek	2000	1,977	Good
Frontage Road 295 over Ten Mile Creek 071	1962	1,929	Poor
Mchugh Ln over Helena Valley Canal 086	2000	1,893	Good
Mchugh Ln over Ten Mile Creek 087	1989	1,893	Good
Birdseye Rd over Seven Mile Creek 034	2001	1,589	Good
Canyon Ferry Rd over Helena Valley Canal	2010	1,589	Good
S Cruse Ave over Pedestrian Underpass	1972	1,548	Poor
Applegate Dr over Helena Valley Canal 115	1958	1,535	Fair
S 200 over Flat Creek	1986	1,507	Fair
S 200 over Middle Fk Dearborn River	1993	1,467	Good
S 200 over Dearborn River	1949	1,432	Fair
S 200 over Stockpass	1949	1,432	Poor
Mill Road over Helena Valley Canal 082	2021	1,219	Good
Lake Helena Dr over Causeway-lake Helena 072	1944	971	Fair
John G Mine Rd over Helena Valley Canal 116	1958	795	Good
Bridge St over Missouri River 062	2006	778	Good
Frontage Road 241 over Little Prickly Pear 059	1966	711	Good
Sierra Road E over Prickly Pear Creek 077	1998	623	Fair
Sierra Road E over Ten Mile Creek 076	2001	623	Good
Glass Dr over Helena Valley Canal 150	1958	611	Fair
Route 284 over Canyon Ferry Spillway	1950	600	Fair
US 287 over Int Augusta I 15	1966	564	Fair
US 287 over Rock Creek	1967	564	Fair
York Rd over Missouri River	1982	551	Fair
York Rd over Trout Creek	1982	551	Good
US 287 over Sun River	1936	538	Fair
Applegate Dr over Silver Creek 144	2005	510	Good
Lincoln Rd W over Canyon Creek	1949	501	Fair
Lincoln Rd W over Canyon Creek	1949	501	Fair
Lincoln Rd W over Little Prickly Pear CR	1949	501	Fair
Norris Rd over Helena Valley Canal 114	1958	491	Good
Craig Frontage Rd over Missouri River 054	1933	484	Poor
S Recreation Rd over Sheep Creek 117	1933	484	Fair
US 287 over Dearborn River	1963	460	Fair
US 287 over Elk Creek	2008	439	Good
US 287 over Elk Creek Overflow	2008	439	Good
US 287 over Flat Creek	2007	429	Good
US 287 over Dry Creek	2008	377	Good
Head Ln over Seven Mile Creek 149	1982	354	Fair
Craig Frontage Rd over Stickney Creek 057	1968	329	Fair
Craig Frontage Rd over Wegner Creek 055	1934	329	Fair
E Riggs St over Prickly Pear Creek 083	1982	316	Good
Stemple Pass Rd over Blackfoot River 118	1959	301	Fair
Stemple Pass Rd over Poorman Creek 153	2009	301	Good
S 21 over Dry Creek 122	1935	260	Fair
S 21 over Elk Creek 119	1935	260	Fair
S 21 over Spring Creek Coulee 124	1982	260	Fair
Little Wolf CR Rd over Wolf Creek 112	2010	237	Good
Little Wolf CR Rd over Wolf Creek 145	2007	237	Good
Little Wolf CR Rd over Wolf Creek 146	2007	237	Good
Nelson Rd over Beaver Creek 121	1975	234	Fair
Remini Rd over Ten Mile Creek 103	2015	231	Good
Rimini Rd over Ten Mile Creek 101	2015	231	Good
Rimini Rd over Ten Mile Creek 102	2015	231	Good
Rimini Rd over Ten Mile Creek 104	1981	231	Good
Rimini Rd over Ten Mile Creek 105	1981	231	Fair
Sun Canyon Rd over Willow Creek 160	2015	200	Good
Copper Creek Road over Copper Creek	2005	169	Good
Nfsr 330 over Copper Creek	2008	169	Good
S 435 over Elk Creek	1958	137	Fair
S 435 over Smith Creek	1958	137	Fair
Lt Prickly Pear Rd over Ltl Prickly Pear CR 097	1952	122	Good
Dearborn Canyon Rd over Dearborn River 048	1982	118	Good
Dearborn Canyon Rd over Falls Creek 049	1960	118	Fair
Dalton Mtn Road over Blackfot River 095	2024	112	Good
Hart Ln over Helena Valley Canal 088	1957	111	Fair
Rimini Rd over Ten Mile Creek 106	1962	107	Fair
Rimini Rd over Tenmile Creek	2023	107	Good
Augusta-clemons Rd over Elk Creek 029	1915	100	Fair
Barr Creek Rd over N Fork Willow Creek 125	1991	100	Good
Barr Creek Rd over Willow Creek 026	1991	100	Good
Beaver Creek Rd over Beaver Creek 142	2001	100	Good
Beaver Creek Rd over Keep Cool Creek 094	1957	100	Fair
Birdtail Rd over Flat Creek 036	1901	100	Poor
Black Bear Rd over Trout Creek 141	2000	100	Good
County Road 290 over Helena Valley Canal 085	1958	100	Good
County Road 811 over Ten Mile Creek 131	2005	100	Fair
Deer Meadow Dr over Ten Mile Creek 130	2006	100	Fair
Elk Creek Rd over Elk Creek 043	2010	100	Good
Elk Creek Rd over Elk Creek 044	2020	100	Good
Elk Creek Rd over Elk Creek 045	2020	100	Good
Elk Creek Rd over Elk Creek 046	2021	100	Good
Keir Ln over Spokane Creek 143	2004	100	Good
Law Enforcement Rd over Prickely Pear Creek	1940	100	Fair
Lost Horse CR Rd over Deadman Creek 098	1990	100	Good
Lovers Lane over Elk Creek 041	1914	100	Poor
Lyons Creek Rd over Little Prickly Pear 005	2001	100	Good
Lyons Creek Rd over Lyons Creek 157	1990	100	Good
Marsh Creek Rd over Ltl Prickly Pear CR 096	1976	100	Good
Mcdonald Ln over Ltl Prickly Pear Crk 151	1990	100	Fair
S Howie St over Reeders Alley 001	1881	100	Fair
Smith Creek Rd over Smith Creek 023	2002	100	Good
Spring Creek Ln over Spring Creek 152	2010	100	Good
Valley Forge Rd over Ten Mile Creek 126	1988	100	Good
Woodbridge Drive over Drainage 002	1975	100	Fair
Fdr #8983 over N Fk Sun River	1927	99	Poor
L25500 over Poorman Creek	2024	89	Good
Stemple Pass Rd over Poorman Creek 140	2007	89	Good
Stemple Pass Rd over Poorman Creek 147	2004	89	Good
Stemple Pass Rd over Poorman Creek 148	2004	89	Good
Stemple Pass Road over Poorman Creek	2021	89	Good
Banner Creek Rd over Ruby Creek	1964	60	Fair
Beaver Creek Road over Beaver Creek	2004	50	Fair
Nfsr 235 over Ford CR.	1983	50	Good
Nfsr 9229 over Wood Creek	1967	50	Fair
No Data Entered over Beaver Creek	2019	50	Good
No Data Entered over Beaver Creek	2018	50	Good
Augusta Rd over Middle Fork Dearborn 010	2014	46	Good
Hogum Ck Road over Blackfoot River	1965	46	Fair
Hogum Ck Road over Hogum Creek	1962	46	Fair
Fdr 235 over Benchmark CR.	1993	40	Fair
Nfsr 235 over Fairview CR.	1977	40	Good
Nfsr 330-a1 over Snowbank Creek	2013	40	Good
Pishkun Road over Sun River	1916	40	Poor
Sawmill Creek Road over Sawmill Creek	2013	40	Good
Chevallier Dr over Little Prickly Pear 109	1905	37	Fair
Chevallier Dr over Little Prickly Pear 110	2012	37	Good
Flat Creek Rd over Flat Creek 017	2007	37	Good
Flat Creek Rd over Flat Creek 134	2006	37	Good
Elk Creek Rd over Elk Creek 021	2002	34	Good
Sucker Kp Kl Road over Copper Creek	1962	34	Fair
Augusta Rd over Dearborn River 011	1896	31	Fair
Minnehaha Road over Ten Mile Creek	1955	30	Fair
Nfsr 495 over Telegraph Creek	1950	30	Poor
Nfsr 233 over Beaver Creek	1978	26	Good
Nfsr 233 over Beaver Creek	1978	26	Fair
Nfsr 233 over Beaver Creek	1978	26	Good
Nfsr 233 over M Fk Beaver Creek	1978	26	Good
Nfsr 233 over W Fk Beaver Creek	1978	26	Good
Nfsr 233 over W Fk Beaver Creek	1978	26	Good
Nfsr 233 over Willow Creek	2004	26	Good
Nfsr 330 over Landers Fork	1977	21	Fair
Cpgd Access over Ten Mile Creek	1957	20	Poor
Fields Glch Road over Poorman Creek	1979	20	Fair
Fields Gulch Road over Poorman Creek	2013	20	Good
County Road 061 over Levings Gulch 158	1933	13	Fair
County Road 061 over Little Prickly Pear 111	1962	13	Fair
Copper Creek Road over Copper Creek	2005	10	Good
050438: Sauerkraut over Sauerkraut Creek	2010	5	Good

Source: FHWA National Bridge Inventory, 2025.

Lewis and Clark County bridge conditions · Montana bridges by county.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.