Total Bridges
5,122
Public highway bridges in Montana
State profile · Near national median SD
Montana bridge safety
Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in Montana — drawn straight from the FHWA National Bridge Inventory.
- 5,122
- Public bridges
- 28.3%
- Good condition
- 6.7%
- Poor condition
- 6.7%
- Structurally deficient
Good Condition
28.3%
1,447 bridges rated 7-9
-21.7pp vs 50% benchmark
Poor Condition
6.7%
343 bridges rated 0-4
Structurally Deficient
6.7%
343 bridges flagged for repair priority
-0.3pp vs national avg 7.0%
Montana vs national bridge condition
Montana — Good condition share 28.3%
National avg
Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).
Montana — Structurally deficient share 22.3%
National avg
Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.
Condition Distribution
Bridge inventory deck-condition mix — Montana (FHWA NBI)
Counties (56)
Beaverhead 217 Big Horn 136 Blaine 101 Broadwater 31 Carbon 77 Carter 39 Cascade 185 Chouteau 42 Custer 71 Daniels 32 Dawson 109 Deer Lodge 68 Fallon 35 Fergus 155 Flathead 195 Gallatin 207 Garfield 26 Glacier 68 Golden Valley 17 Granite 73 Hill 44 Jefferson 128 Judith Basin 48 Lake 111 Lewis and Clark 196 Liberty 11 Lincoln 190 Madison 84 McCone 44 Meagher 52 Mineral 152 Missoula 205 Musselshell 25 Park 124 Petroleum 26 Phillips 100 Pondera 96 Powder River 23 Powell 112 Prairie 46 Ravalli 149 Richland 96 Roosevelt 57 Rosebud 114 Sanders 116 Sheridan 66 Silver Bow 66 Stillwater 90 Sweet Grass 89 Teton 81 Toole 35 Treasure 26 Valley 103 Wheatland 26 Wibaux 24 Yellowstone 283
Montana vs nearby ranks
Adjacent states on the structurally deficient leaderboard (lower share = better)
States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below Montana on the same metric.
37
North Carolina
6.16% top marginal rate
15
Hawaii
6.47% top marginal rate
30
Montana
6.70% top marginal rate
36
New York
6.90% top marginal rate
21
Kentucky
7.06% top marginal rate
Bridges Needing Most Attention in Montana
Six lowest-condition bridges in Montana, ranked by composite NBI rating. Each is inspected at least every 24 months.
HWY 91 N
PoorOver: BIG HOLE RIVER 041
22M N DILLON, Beaverhead, MT
Built 1940 Load: 2.7 t ADT: 155
SLEEPY HOLLOW LN
Structurally DeficientOver: PRICKLY PEAR CREEK
3 M S MONTANA CITY, Jefferson, MT
Built 2010 Load: 2.7 t ADT: 100
CARBINE RD
PoorOver: PABLO CANAL 026
4M W PABLO, Lake, MT
Built 1986 Load: 2.7 t ADT: 100
BOY SCOUT RD
PoorOver: CLEARWATER RIVER 082
2M NW SEELEY LAKE, Missoula, MT
Built 1938 Load: 2.7 t ADT: 100
ASHLEY LAKE RD
PoorOver: PABLO FEEDER CANAL 045
5M NE ST IGNATIUS, Lake, MT
Built 1965 Load: 3.0 t ADT: 100
SHEEP CR RD
Structurally DeficientOver: SHEEP CREEK 097
12M S CASCADE, Cascade, MT
Built 1950 Load: 3.6 t ADT: 68
All Bridges in Montana
IRR BIA RTE 8
FairOver: CUT BANK CREEK
11 KM NW OF BROWNING, Glacier, MT
Built 1965 Load: 32.7 t ADT: 500
RISING SUN CAMPGRO
FairOver: ROES CREEK
6.8 miles southwest from, Glacier, MT
Built 1965 Load: 32.7 t ADT: 1,942
SULLIVAN BRIDGE RD
FairOver: MARIAS RIVER 030
14M SE CUTBANK, Glacier, MT
Built 1968 Load: 32.7 t ADT: 100
IRR - S 49
FairOver: TWO MEDICINE RIVER 001
3M N EAST GLACIER, Glacier, MT
Built 1966 Load: 32.7 t ADT: 1,926
IRR - US 89
FairOver: TWO MEDICINE CANAL
10M SE BROWNING, Glacier, MT
Built 1950 Load: 32.7 t ADT: 1,380
S 213
FairOver: S FORK MILK RIVER
30M NW SANTA RITA, Glacier, MT
Built 1973 Load: 32.7 t ADT: 128
DUCK LAKE RD
FairOver: DRY FORK MILK RIVER
12M SE BABB, Glacier, MT
Built 1977 Load: 32.7 t ADT: 861
US 12
FairOver: NINE MILE CREEK
7M W LAVINA, Golden Valley, MT
Built 1990 Load: 32.7 t ADT: 1,905
S 3
FairOver: MUSSELSHELL RIVER
LAVINA, Golden Valley, MT
Built 1959 Load: 32.7 t ADT: 2,052
NO DATA ENTERED
FairOver: WEST FORK ROCK CR
WEST FORK ROCK CR, Granite, MT
Built 1965 Load: 32.7 t ADT: 50
S 1
FairOver: ABANDONED RAILROAD
DRUMMOND, Granite, MT
Built 1966 Load: 32.7 t ADT: 1,329
IRR BIA RTE 2
FairOver: BOX ELDER CREEK
1.3 KM N ROCKY BOYS AGCY, Hill, MT
Built 1992 Load: 32.7 t ADT: 1,400
S 449
FairOver: SAGE CREEK
GILDFORD, Hill, MT
Built 1968 Load: 32.7 t ADT: 258
LEGAL TENDER LN
FairOver: PRICKLY PEAR CREEK 070
CLANCY, Jefferson, MT
Built 1976 Load: 32.7 t ADT: 100
RAILROAD WAY
FairOver: PRICKLY PEAR CREEK 065
CLANCY, Jefferson, MT
Built 1976 Load: 32.7 t ADT: 100
MCCLELLAN CREEK RD
FairOver: MCCLELLAN CREEK 021
MONTANA CITY, Jefferson, MT
Built 1975 Load: 32.7 t ADT: 100
TEBAY LN
FairOver: JEFFERSON SLOUGH 014
3M W CARDWELL, Jefferson, MT
Built 1991 Load: 32.7 t ADT: 177
YELLOWSTONE TRAIL
FairOver: WHITETAIL CREEK 024
WHITEHALL-YELLOWSTONE TRL, Jefferson, MT
Built 1986 Load: 32.7 t ADT: 100
PORCUPINE RIDGE RD
FairOver: MID FORK JUDITH RV 035
2M S SAPPHIRE, Judith Basin, MT
Built 2008 Load: 32.7 t ADT: 100
N VALLEY CREEK RD
FairOver: JOCKO RIVER 054
2M S RAVALLI, Lake, MT
Built 1970 Load: 32.7 t ADT: 451
N CROW RD
FairOver: PABLO FEEDER CANAL 007
3M SE PABLO, Lake, MT
Built 1978 Load: 32.7 t ADT: 100
UNKNOWN
FairOver: PRICKELY PEAR CREEK
5M NE HELENA, Lewis and Clark, MT
Built 1940 Load: 32.7 t ADT: 100
WYLIE DR
FairOver: HELENA VALLEY CANAL 081
2M N EAST HELENA, Lewis and Clark, MT
Built 1958 Load: 32.7 t ADT: 4,571
SIERRA ROAD E
FairOver: PRICKLY PEAR CREEK 077
5M NE HELENA, Lewis and Clark, MT
Built 1998 Load: 32.7 t ADT: 619
RIMINI RD
FairOver: TEN MILE CREEK 105
15M SW HELENA, Lewis and Clark, MT
Built 1981 Load: 32.7 t ADT: 230
EDNA CREEK RD
FairOver: FORTINE CREEK 132
4M SW TREGO, Lincoln, MT
Built 1983 Load: 32.7 t ADT: 100
SINCLAIR CREEK RD
FairOver: SINCLAIR CREEK 160
3M NE EUREKA, Lincoln, MT
Built 1977 Load: 32.7 t ADT: 100
LAKE CREEK RD
FairOver: LAKE CREEK 074
4M S TROY, Lincoln, MT
Built 1970 Load: 32.7 t ADT: 100
HOUGHTON CREEK RD
FairOver: FISHER RIVER 086
12M W HAPPY`S INN, Lincoln, MT
Built 1985 Load: 32.7 t ADT: 100
MEADOW CREEK RD
FairOver: FORTINE CREEK 133
E FORTINE, Lincoln, MT
Built 1989 Load: 32.7 t ADT: 1,203
W 6TH ST
FairOver: FLOWER CREEK 004
W EDGE LIBBY, Lincoln, MT
Built 1968 Load: 32.7 t ADT: 1,723
US 2
FairOver: LAKE CREEK
1M SE TROY, Lincoln, MT
Built 1989 Load: 32.7 t ADT: 3,987
S 37 FH 57
FairOver: FIVE MILE CREEK
12M N LIBBY DAM, Lincoln, MT
Built 1974 Load: 32.7 t ADT: 449
S 37 FH 57
FairOver: TEN MILE CREEK
18M N LIBBY DAM, Lincoln, MT
Built 1974 Load: 32.7 t ADT: 324
KOUNTZ RD
FairOver: JEFFERSON RIV OVRFLW 016
2M S WHITEHALL, Madison, MT
Built 1977 Load: 32.7 t ADT: 264
LEWIS LN
FairOver: RUBY RIVER 021
5M W SHERIDAN, Madison, MT
Built 1975 Load: 32.7 t ADT: 247
COTTONWOOD CREEK R
FairOver: RUBY RIVER 061
9M S ALDER, Madison, MT
Built 1984 Load: 32.7 t ADT: 100
SWEETWATER RD
FairOver: RUBY RIVER 059
11M S ALDER, Madison, MT
Built 1998 Load: 32.7 t ADT: 100
PRIMROSE LN
FairOver: JEFFERSON RIVER OVERFLOW
2M E SILVERSTAR, Madison, MT
Built 1977 Load: 32.7 t ADT: 108
WELDON RD
FairOver: REMUDA CREEK 018
30M NW VIDA, McCone, MT
Built 1979 Load: 32.7 t ADT: 100
LINSHIRE RD
FairOver: ROCK CREEK 005
35M NW WHITE SULPHUR SPR, Meagher, MT
Built 1981 Load: 32.7 t ADT: 79
CLEAR RANGE RD
FairOver: SMITH RIVER 014
CAMP BAKER, Meagher, MT
Built 1976 Load: 32.7 t ADT: 100
SMITH RIVER ROAD
FairOver: SHEEP CREEK 003
10M N FORT LOGAN, Meagher, MT
Built 1979 Load: 32.7 t ADT: 131
BIRKY RD
FairOver: S FORK SMITH RIVER 028
7M SW WHITE SULPHUR SPR, Meagher, MT
Built 1980 Load: 32.7 t ADT: 31
S 294
FairOver: SAWMILL CREEK
15M SW MARTINSDALE, Meagher, MT
Built 1940 Load: 32.7 t ADT: 171
S 294
FairOver: S FORK MUSSELSHELL RIVER
MARTINSDALE, Meagher, MT
Built 2010 Load: 32.7 t ADT: 276
I 90
FairOver: ST. REGIS RVR-INT RAMP
ST. REGIS, Mineral, MT
Built 1983 Load: 32.7 t ADT: 442
I 90 WB
FairOver: RR
9.3M E SUPERIOR, Mineral, MT
Built 1967 Load: 32.7 t ADT: 3,776
I 90
FairOver: RR
9.3M W ALBERTON, Mineral, MT
Built 1965 Load: 32.7 t ADT: 4,036
BIG CREEK RD
FairOver: ST REGIS RIVER 019
HAUGAN, Mineral, MT
Built 1972 Load: 32.7 t ADT: 100
Showing 2,501-2,550 of 5,122 bridges
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges Editorial.
Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the FHWA National Bridge Inventory (NBI). A "structurally deficient" rating is a repair-priority signal, not a closure or unsafe-to-cross designation. Consult a qualified civil engineer before making decisions based on this data.
Understanding Bridge Conditions
How FHWA rates bridge condition on a 0-9 scale.
Check Your Daily Bridges
How to look up bridge condition data for bridges on your route.
Read our methodology — how this data is sourced, computed, and verified.
| Publisher | Kiznis Studio |
| Sources | FHWA National Bridge Inventory, public U.S. government datasets |