Worst Bridges in Montana

Bridges with the lowest condition ratings in Montana. Montana has 356 bridges in poor condition (6.8% of 5,224 total bridges).

5,224

Total Bridges

6.8%

In Poor Condition

356

Poor Bridges

356

Rating 0-4

Understanding Bridge Conditions in Montana

Montana's bridge infrastructure reflects decades of construction, maintenance, and replacement decisions influenced by geography, climate, traffic patterns, and available funding. With 356 bridges currently rated in poor condition (6.8% of the total inventory), understanding what these ratings mean helps residents and policymakers make informed decisions about infrastructure investment.

Federal inspectors evaluate three key components on every highway bridge: the deck (the driving surface and its immediate supports), the superstructure (beams, girders, trusses, or other primary load-carrying members), and the substructure (piers, abutments, and foundations that transfer loads to the ground). Each component receives a rating from 0 to 9, with the lowest of these three ratings determining the overall condition category. A rating of 4 or below classifies a bridge as “poor,” indicating significant structural deterioration that warrants prioritized attention.

Poor-rated bridges remain safe for use at their posted limits because federal law requires that any bridge with load-carrying deficiencies be either repaired, posted with weight restrictions, or closed. Many poor-rated bridges receive more frequent inspections than the standard 24-month cycle, allowing engineers to monitor deterioration rates and ensure conditions have not worsened beyond safe operating limits. Weight restrictions protect the structure while allowing continued service until rehabilitation or replacement can be funded and constructed.

Infrastructure investment decisions involve difficult trade-offs between maintaining aging structures and building new capacity. Bridges listed below represent the most deteriorated structures in Montana's inventory, where rehabilitation or replacement investment would have the greatest impact on improving overall infrastructure condition. Understanding where these bridges are located helps communities advocate for appropriate funding and plan alternative routes when load restrictions affect commercial traffic.

Condition Rating Scale

0-2

Failed to Critical

Closed or severely restricted. Major deterioration requiring immediate action.

3-4

Serious to Poor

Significant deterioration affecting capacity. Often weight-restricted.

5-6

Fair

Minor deterioration visible. Maintenance recommended but not urgent.

7-9

Good to Excellent

Components in sound condition with no significant deficiencies.

Lowest Rated Bridges in Montana

356 bridges rated 0-4 on the federal condition scale, sorted by lowest rating first. Showing first 50 — click below to expand. Displaying top 200 of 356.

Rank	Bridge	Rating	Year Built	Condition
#1	IRR BIA RTE 209 over ROSEBUD CREEK 8.1 KM WEST OF LAME DEER	2	1971	Poor
#2	IRR ROUTE 46 over BIG SANDY CREEK 11 KM NNW OF BOX ELDER	2	1963	Poor
#3	MOUNTAIN VIEW RD over PABLO FEEDER CANAL 004 6M SE POLSON	2	1982	Poor
#4	NFSR #487 over S FK JUDITH RIVER 15 MI. SW OF UTICA	2	1958	Poor
#5	NFSR #487 over S FK JUDITH RIVER 19 MI. SW OF UTICA	2	1958	Poor
#6	NO DATA ENTERED over SWAMP GUL SWAMP GULCH	2	1987	Poor
#7	FDR 211 over FOUR MILE CREEK 7.8 MI SE US12/FDR211 JCT	2	1973	Poor
#8	RD 320 over CEDAR CR CEDAR CR	2	1959	Poor
#9	NFSR 839 over BELT CREEK 8.4 MI. W OF US 89 JCT	2	1954	Poor
#10	MCCLELLEAN CK ROAD over MCCLELLAN CREEK MCCLELLAN	2	1959	Poor
#11	384 SPAR LAKE RD. over SPAR CR 2.1 MI PAST CAMPGROUND	2	1955	Poor
#12	NO DATA ENTERED over WISE RIVER SHEEP CR.	2	1992	Poor
#13	FDR 7391 over NO DATA ENTERED NO DATA ENTERED	2	1987	Poor
#14	HWY 91 N over BEAVERHEAD RIVER 033 1M N DILLON	3	1946	Poor
#15	US 2 over LODGE CREEK CHINOOK	3	1942	Poor
#16	S 37 FH 57 over PINKHAM CREEK 7M S REXFORD	3	1971	Poor
#17	AXTELL ANCENY RD over GALLATIN RIVER 084 2M N GALLATIN GATEWAY	3	1919	Poor
#18	HWY 287 BYPASS over MISSOURI RIVER 019 TOSTON	3	1920	Poor
#19	MAIN BOULDER ROAD over BOULDER RIVER 38 M SOUTH OF SPRINGDALE	3	1950	Poor
#20	DALTON MNT RD over BLACKFOOT RIVER 095 3M W LINCOLN	3	1956	Poor
#21	SLEEPY HOLLOW LN over PRICKLY PEAR CREEK 3 M S MONTANA CITY	3	2010	Poor
#22	ROCK CREEK RD over BIG LAKE CREEK 081 4M SW WISDOM	3	1958	Poor
#23	BIG SWAMP CR RD / over BIG HOLE RIVER 089 5M NW JACKSON	3	1925	Poor
#24	RANDALL RD over TWO LEGGIN`S CANAL 015 3M SW HARDIN	3	1940	Poor
#25	EKEGREN RD over THIRTY MILE CREEK 097 3M E HARLEM	3	1938	Poor
#26	COUNTY ROAD 224 over COAL CREEK 010 16M N PEERLESS	3	1960	Poor
#27	COAL CREEK RD over COAL CREEK 027 12M N PEERLESS	3	1950	Poor
#28	OLD TOWN RD over JEFFERSON RIVER 063 2M N THREE FORKS	3	1894	Poor
#29	WELCH RD over TWO MEDICINE CANAL 016 12M SW CUT BANK	3	1960	Poor
#30	VALLEY RD over CROW CREEK 066 10M SW RONAN	3	1965	Poor
#31	PAULSON RD over PABLO A CANAL 034 5M S POLSON	3	1960	Poor
#32	HOMESTEAD DR over PINKHAM CREEK 140 9M SW EUREKA	3	1914	Poor
#33	HAMMOND CREEK RD over ROCK CREEK 025 5M E CLYDE PARK	3	1967	Poor
#34	MCLEOD MAIN ST over WEST BOULDER RIVER 025 MCLEOD	3	1912	Poor
#35	FOX FARM RD over ESPEIL COULEE 008 9M E GLASGOW	3	1930	Poor
#36	W BROADWAY STREET over BIG SPRING CREEK 062 LEWISTOWN-W BROADWAY ST	3	1940	Poor
#37	SHEEP CR RD over SHEEP CREEK 097 12M S CASCADE	3	1950	Poor
#38	MILWAUKEE RD over YELLOWSTONE RIVER 030 4M SW TERRY	3	1907	Poor
#39	CANYON CR ROAD over CANYON CR CANYON CR	3	1952	Poor
#40	NO DATA ENTERED over EF CHICKEN CREEK NO DATA ENTERED	3	2021	Poor
#41	BLACK COULEE RD over BLACK COULEE 072 28M N DODSON	3	1950	Poor
#42	PISHKUN ROAD over Sun River 19 miles NW of Augusta	3	1916	Poor
#43	IRR BIA RTE 123 over SOUTH FORK VALLEY CREEK 10.3 KM FROM US HWY 93	3	1995	Poor
#44	FDR 624 over RUBY CR RUBY CR	3	1952	Poor
#45	RYAN CANYON RD over BEAVERHEAD RIVER 023 1.2M S BARRETTS INT	3	1908	Poor
#46	I 90 over INT RESERVE STREET MISSOULA	4	1966	Poor
#47	I 90 over CLARK FORK RIVER 5M W DRUMMOND	4	1970	Poor
#48	I 90 over CLARK FORK RIVER 6.2M E ALBERTON	4	1964	Poor
#49	I 90 over ABANDONED RR THREE FORKS	4	1969	Poor
#50	MONTANA AVE over U1025-RR BILLINGS-MONTANA AVE	4	1960	Poor
#51	MONTANA AVE over U1024-25-RR BILLINGS-MONTANA AVE	4	1960	Poor
#52	S 82 over FLATHEAD RIVER 3M NW BIG FORK	4	1955	Poor
#53	LINCOLN RD over INT LINCOLN-I 15 10M N HELENA	4	1962	Poor
#54	IRR - US 93 over NINE PIPE RESERVOIR 5M S RONAN	4	1933	Poor
#55	I 90 EB over RR 4.3M W GARRISON	4	1973	Poor
#56	I 90 over RR 4.3M W GARRISON	4	1973	Poor
#57	US 2 over BIG CHERRY CREEK 3M SW LIBBY	4	1976	Poor
#58	I 90 over INT W GARRISON-RR GARRISON	4	1979	Poor
#59	S 78 over YELLOWSTONE RIVER COLUMBUS	4	1957	Poor
#60	I 94 over CLEAR CREEK 10M SW GLENDIVE	4	1973	Poor
#61	I 90 over SEP ELIZABETH LN 9.9M W ALBERTON	4	1965	Poor
#62	I 90 over CLARK FORK RIVER 9.3M W ALBERTON	4	1965	Poor
#63	OLD HWY 312 over YELLOWSTONE RIVER 170 HUNTLEY	4	1949	Poor
#64	I 90 over CLARK FORK RIVER 3.7M W SUPERIOR	4	1984	Poor
#65	NORTH AVE W over BITTERROOT RIVER 010 W MISSOULA	4	1935	Poor
#66	IRR - US 2 over MILK RIVER FORT BELKNAP AGENCY	4	1964	Poor
#67	US 89 over INT EAST LIVINGSTON I 90 2M NE LIVNGSTON	4	1962	Poor
#68	S 16 over CRANE CREEK CRANE	4	1957	Poor
#69	US 191 FH 42 over TEEPEE CREEK 11M N WEST YELLOWSTONE	4	1962	Poor
#70	OLD US 10 over BIG DITCH 051 4M W LAUREL	4	1932	Poor
#71	S 200 over CLARK FORK RIVER 1M W THOMPSON FALLS	4	1960	Poor
#72	S 23 over YELLOWSTONE RIVER 2M S SIDNEY	4	1994	Poor
#73	IRR - US 2 over CHELSEA CREEK 12M E WOLF POINT	4	1960	Poor
#74	LOLO ST over RATTLESNAKE CREEK 009 MISSOULA-LOLO STREET	4	1966	Poor
#75	S 287 over WEBER IRRIGATION CANAL 2M SW ENNIS	4	1950	Poor
#76	US 2 over IRRIGATION-STOCKPASS 1M E CHINOOK	4	1940	Poor
#77	S MAIN AVE over MISSION CREEK 052 ST IGNATIUS-S MAIN ST	4	1929	Poor
#78	HWY 282 over PRICKLY PEAR CREEK 2.3 S MONTANA CITY	4	1969	Poor
#79	S SHILOH RD over SEP I 90 2M SW BILLINGS	4	1959	Poor
#80	S 91 over BOULDER RIVER OVERFLOW BIG TIMBER	4	1937	Poor
#81	IRR - US 2 over RR 10M SE WEST GLACIER	4	1956	Poor
#82	US 2 over DRAINAGE 4M E CHINOOK	4	1940	Poor
#83	US 2 over DRAINAGE ZURICH	4	1940	Poor
#84	CHURCHILL RD over CAMP CREEK 2M N AMSTERDAM	4	1949	Poor
#85	MT 55 over FISH CREEK 9M SW WHITEHALL	4	1953	Poor
#86	SKALKAHO HWY over SKALKAHO CREEK 053 1M E GRANTSDALE	4	1941	Poor
#87	I 15 over INT MONIDA S 509 MONIDA	4	1959	Poor
#88	MULLAN RD over IRRIGATION CANAL 6M SE FRENCHTOWN	4	1970	Poor
#89	BRIDGE ST over SWAN RIVER 110 S END BIG FORK	4	1911	Poor
#90	IRR - US 2 over DRAINAGE 3M E POPLAR	4	1970	Poor
#91	S 141 over NEVADA CREEK 13M NW AVON	4	1936	Poor
#92	S 200 over RR 2M SE NOXON	4	1957	Poor
#93	US 87 over DRAINAGE 13M NW GRASS RANGE	4	1939	Poor
#94	US 2 over CHAPMAN COULEE 7M NW GLASGOW	4	1948	Poor
#95	US 2 over MOONEY COULEE 6M NW GLASGOW	4	1948	Poor
#96	S 200 over STOCKPASS 23M SW SIMMS	4	1949	Poor
#97	S 474 over RR 4M SE FRENCHTOWN	4	1959	Poor
#98	S 1 over CLARK FORK DRUMMOND	4	1966	Poor
#99	S 37 FH 57 over TOBACCO RIVER 2M E REXFORD	4	1971	Poor
#100	IRR - US 2 over DRAINAGE 1M W DODSON	4	1973	Poor
#101	W DRY CREEK RD over BAKER CREEK 1M E MANHATTAN	4	1967	Poor
#102	S 83 FH 15 over LION CREEK 17M S SWAN LAKE	4	1996	Poor
#103	S 287 over GRANITE CREEK 3M NW VIRGNIA CITY	4	1942	Poor
#104	US 89 FH 32 over BELT CREEK 9M S BELT	4	1968	Poor
#105	S 200 over CEMETERY COULEE 14M W BROCKWAY	4	1939	Poor
#106	S 200 over DRAINAGE 14M W BROCKWAY	4	1939	Poor
#107	S 200 over DRAINAGE 10M W BROCKWAY	4	1939	Poor
#108	IRR - S 24 over EAST FORK CHERRY CREEK 6M NE GLASGOW	4	1948	Poor
#109	MT HWY 2 over RR 061 4M W WHITEHALL	4	1932	Poor
#110	IRR-US 2 over UNSTABLE SLOPE 1.9M SE ESSEX	4	1981	Poor
#111	IRR - US 89 over BLACKTAIL CREEK 16M NW VALIER	4	1965	Poor
#112	S 80-13TH ST over MISSOURI RIVER FORT BENTON-13TH ST	4	1962	Poor
#113	US 12 FH 11 over LOLO CREEK LOLO HOT SPRINGS	4	1957	Poor
#114	US 191 over S FORK AMERICAN FORK 11M S HARLOWTON	4	1941	Poor
#115	KOOTENAI RIVER RD over PIPE CREEK 4M N LIBBY	4	1987	Poor
#116	POPLAR RIVER RD over POPLAR RIVER 015 22M N POPLAR	4	1985	Poor
#117	US 191 over RYE CREEK 2M S MELVILLE	4	1947	Poor
#118	US 191 over FISH CREEK 14M S HARLOWTON	4	1942	Poor
#119	US 191 over MISSOURI RIVER 29M NE ROY	4	1959	Poor
#120	S 200 over BRIGGS COULEE 8M NE GRASS RANGE	4	1930	Poor
#121	S 37 FH 57 over CADETTE CREEK 7M S REXFORD	4	1971	Poor
#122	OLD HWY 10 E over SMITH CREEK 053 1M W FORSYTH	4	1928	Poor
#123	MT HWY 91 over RR 3M SW DILLON	4	1936	Poor
#124	S MAIN STREET over CLARK FORK RIVER 020 S DRUMMOND	4	1934	Poor
#125	OLD HWY 87 over TWO LEGGINS CANAL 0 1M W HARDIN	4	1931	Poor
#126	SR 117 over MISSOURI RIVER OVERFLOW 1M N FORT PECK	4	1950	Poor
#127	S 21 over INT MIDWAY I 15 3M SE CONRAD	4	1972	Poor
#128	S 78 FH 83 over RED LODGE CREEK 7M SE ROSCOE	4	1953	Poor
#129	S 7 over DRAINAGE 1M NE EKALAKA	4	1940	Poor
#130	S 37 FH 57 over CRIPPLE HORSE CREEK 6M NE LIBBY DAM	4	1974	Poor
#131	6TH AVE S over BIG SPRING CREEK 133 LEWISTOWN-6TH AVE S	4	1962	Poor
#132	CRAIG FRONTAGE RD over MISSOURI RIVER 054 2M NE WOLF CREEK	4	1933	Poor
#133	S 7 over COLLINS CREEK 6M NE EKALAKA	4	1940	Poor
#134	IRR - S 382 over RR 1M E PERMA	4	1965	Poor
#135	IRR - US 191 over WILD HORSE CREEK 20M SW MALTA	4	1941	Poor
#136	IRR - US 191 over WILD HORSE CREEK 20M SW MALTA	4	1940	Poor
#137	OLD HWY 10 W over CLARK FORK 054 3M W ALBERTON	4	1932	Poor
#138	S 37 FH 57 over ROCK GUT 22M N LIBBY DAM	4	1974	Poor
#139	S 5 over DAHL CREEK 12M SW WESTBY	4	1939	Poor
#140	LIGHT RD over PABLO 31A CANAL 036 5M S POLSON	4	2009	Poor
#141	US 191 over BOX ELDER CREEK 2M E ROY	4	1942	Poor
#142	FRONTAGE ROAD 018 over IRRIGATION DITCH 001 1M E HYSHAM	4	1933	Poor
#143	S 223 over MARIAS RIVER 18M SE CHESTER	4	1966	Poor
#144	S 529-CLEAR CR RD over MILK RIVER 1M W CHINOOK	4	1967	Poor
#145	IRR - S 358 over TWO MEDICINE RIVER 12M S CUT BANK	4	1968	Poor
#146	S 244 over YELLOW WATER CR-ELK CR 5M S WINNETT	4	1948	Poor
#147	US 12 over DRAINAGE 18M NW FORSYTH	4	1938	Poor
#148	FRONTAGE ROAD 018 over DRAINAGE 009 4M E HYSHAM	4	1933	Poor
#149	REDROCK RD over FORT BELKNAP CANAL 008 3M NW CHINOOK	4	1933	Poor
#150	JACK CREEK RD over JACK CREEK 028 8M E ENNIS	4	1952	Poor
#151	S FRONTAGE RD W over CLARK FORK 053 2M W ALBERTON	4	1916	Poor
#152	MARSHALL CREEK RD over ROCK CREEK 14M W PHILIPSBURG	4	1959	Poor
#153	NF-6639 RD over BOULDER RIVER 041 35M S SPRINGDALE	4	1933	Poor
#154	HWY 91 N over BIG HOLE RIVER 041 22M N DILLON	4	1940	Poor
#155	BATTLEFIELD ROAD over MEDICINE TAIL COULEE I-90 EXIT 510 EAST ON U	4	1938	Poor
#156	US 12 over DRAINAGE 4M E SUMATRA	4	1947	Poor
#157	US 12 over DRAINAGE 31M NW FORSYTH	4	1941	Poor
#158	HWY 10 W over NINEMILE CREEK 035 3M W HUSON	4	1924	Poor
#159	HWY 10 W over NINEMILE SLIDE 026 3M W HUSON	4	1947	Poor
#160	NO DATA ENTERED over ROCK CR NO DATA ENTERED	4	1970	Poor
#161	SILVER SPRING RD over RUBY RIVER 023 3M S SHERIDAN	4	1927	Poor
#162	BEAR GULCH RD over CLARK FORK RIVER 002 1M NE BEARMOUTH	4	1986	Poor
#163	FRONTAGE ROAD 303 over GRAVEYARD CREEK 055 1M E HATHAWAY	4	1928	Poor
#164	ROCKY BUTTE RD over CROW CREEK 070 2M SW RONAN	4	1986	Poor
#165	RED ROCK RD over LIMEKILN CANYON 022 7M NW DELL	4	1931	Poor
#166	OLD HWY 10 E over ST REGIS RIVER 059 ST REGIS	4	1937	Poor
#167	LOWER GAME RANGE R over COTTONWOOD CREEK 7M N OVANDO	4	1990	Poor
#168	IRR BIA RTE 2 over DAWSON CREEK 2.4 KM SE OF E.GLACIER	4	1932	Poor
#169	I 90 over ANTELOPE CREEK 11.2M W DRUMMOND	4	1971	Poor
#170	UPPER N FORK RD over N FK BIGHOLE RIVER 064 6M NW WISDOM	4	1977	Poor
#171	MINER LAKE RD over GOVERNOR CREEK 092 1M SW JACKSON	4	1951	Poor
#172	BLACKTAIL RD over EAST BENCH CANAL 006 2M S DILLON	4	1962	Poor
#173	STIBAL LN over RED ROCK RIVER 053 9M NE MONIDA	4	1975	Poor
#174	BROWNS BRIDGE RD over BIG HOLE RIVER 123 6.2M S MELROSE	4	1915	Poor
#175	MIDDLE RD over BATTLE CREEK 056 4M N CHINOOK	4	1920	Poor
#176	FLYNN LN over BROADWATER MISSOURI 006 5M N TOSTON	4	1976	Poor
#177	W PRYOR RD over ELBOW CREEK 037 3M W EDGAR	4	1964	Poor
#178	TRULY CUTOFF RD over SMITH RIVER 033 7M SE ULM	4	1908	Poor
#179	OLD US HWY 91 over LITTLE MUDDY CREEK 090 6M N CASCADE	4	1923	Poor
#180	UPPER HIGHWOOD CR over HIGHWOOD CREEK 076 4M SE HIGHWOOD	4	1969	Poor
#181	UPPER HIGHWOOD CR over HIGHWOOD CREEK 069 6M SE HIGHWOOD	4	1969	Poor
#182	FRONTAGE ROAD 205 over SNELL CREEK 073 17M SW MILES CITY	4	1928	Poor
#183	COUNTY ROAD 226 over COAL CREEK 038 13M N RICHLAND	4	1971	Poor
#184	COUNTY ROAD 524 over N FK THIRTEN MILE CR 091 9M NE BLOOMFIELD	4	1983	Poor
#185	COUNTY ROAD 542 over THIRTEEN MILE CR 061 5M NW INTAKE	4	1964	Poor
#186	COUNTY ROAD 530 over S FK BURNS CREEK 092 12M NW INTAKE	4	1975	Poor
#187	COUNTY ROAD 098 over CLARK FORK RIVER 020 2M N WARM SPRINGS	4	1920	Poor
#188	MT EVANS WAY over WARM SPRINGS CREEK 016 WARM SPRINGS	4	1912	Poor
#189	FAIRVIEW RD over S FORK MCDONALD CR 123 3M E FORESTGROVE	4	1962	Poor
#190	HOLT STAGE RD over FLATHEAD RIV OVERFL0 014 2M E KALISPELL	4	1992	Poor
#191	MAIDEN ROCK RD over BRIDGER CREEK 106 3M E BOZEMAN	4	1940	Poor
#192	STAGECOACH TRL RD over BAKER CREEK 082 2M NW BELGRADE	4	1959	Poor
#193	STEVES FORK RD over STEVES FORK CREEK 003 15M NW JORDAN	4	1980	Poor
#194	ROAD 290 N over CANADIAN COULEE 036 30M N INVERNESS	4	1980	Poor
#195	48TH ST W over BEAVER CREEK 046 2M SW HAVRE	4	1966	Poor
#196	I 15 FRONTAGE RD over CATARACT CREEK 030 1M E BASIN	4	1933	Poor
#197	I 15 FRONTAGE RD over BASIN CREEK 041 BASIN	4	1985	Poor
#198	E ELK PARK RD over BISON CREEK 016 1M S ELK PARK	4	1927	Poor
#199	LIL BITTERROOT RD over LITTLE BITTERROOT R 061 7M NE HOT SPRINGS	4	1965	Poor
#200	CARBINE RD over PABLO CANAL 026 4M W PABLO	4	1986	Poor

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Data Source: Federal Highway Administration (FHWA) National Bridge Inventory 2024

Bridge inspection data is typically updated every 24 months. Conditions may have changed since the last inspection.

“Structurally deficient” does not mean a bridge is unsafe or likely to collapse. It indicates that one or more key structural elements are in poor or worse condition. Bridges are inspected regularly and may have load restrictions in place.

This data is for informational purposes only and should not be used for route clearance or vehicle weight decisions.