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
AUGUSTA-CLEMONS RD
FairOver: ELK CREEK 029
2M SW AUGUSTA, Lewis and Clark, MT
Built 1915 Load: 7.3 t ADT: 100
MT 37 FH 57
FairOver: SUTTON CREEK
13M S REXFORD, Lincoln, MT
Built 1974 Load: 7.3 t ADT: 324
HORSE CR RD
FairOver: FLATHEAD CREEK 020
WILSALL-HORSE CR RD, Park, MT
Built 1912 Load: 7.3 t ADT: 100
ROAD 201
FairOver: FOURCHETTE CREEK
SECT 6 T22N R31E, Phillips, MT
Built 1970 Load: 7.3 t ADT: 5
DUPUYER CREEK RD
FairOver: DUPUYER CREEK 067
8M SW DUPUYER, Pondera, MT
Built 1938 Load: 7.3 t ADT: 100
COUNTY ROAD 335
FairOver: USBR MAIN CANAL 001
8M SW SAVAGE, Richland, MT
Built 1907 Load: 7.3 t ADT: 100
COUNTY ROAD 430
FairOver: DUNLAP CREEK 059
3M NW SAVAGE, Richland, MT
Built 1951 Load: 7.3 t ADT: 100
COUNTY ROAD 105
FairOver: W BLACKTAIL CREEK 007
6M NE INGOMAR, Rosebud, MT
Built 1940 Load: 7.3 t ADT: 100
BEAVERTON RD
FairOver: BEAVER CREEK 104
6M SE SACO, Valley, MT
Built 1915 Load: 7.3 t ADT: 68
NO DATA ENTERED
FairOver: TROUT CREEK
NO DATA ENTERED, Mineral, MT
Built 1950 Load: 7.5 t ADT: 50
NO DATA ENTERED
FairOver: BLIND CANYON CREEK
NO DATA ENTERED, Missoula, MT
Built 1985 Load: 7.5 t ADT: 50
CUT THROAT DR
FairOver: COVE DITCH 015
LAKESIDE ESTATES, Yellowstone, MT
Built 1991 Load: 7.8 t ADT: 100
KELLY CANYON RD
FairOver: BRIDGER CREEK 047
6M NE BOZEMAN, Gallatin, MT
Built 1983 Load: 8.1 t ADT: 100
ARMELLS ROAD
FairOver: ARMELLS CREEK
11M NE HILGER, Fergus, MT
Built 2022 Load: 8.2 t ADT: 100
BURMA RD
FairOver: BIG HOLE RIVER 014
14M NW SHERIDAN, Madison, MT
Built 1987 Load: 8.2 t ADT: 100
CANYON CREEK RD
FairOver: BRACKETT CREEK 006
2M SW CLYDE PARK, Park, MT
Built 1975 Load: 8.2 t ADT: 100
MILK RIVER ROAD
FairOver: FRENCHMAN CREEK 126
12M NE SACO, Phillips, MT
Built 1950 Load: 8.2 t ADT: 22
BULLHEAD RD
FairOver: BIRCH CREEK 022
7M NW VALIER, Pondera, MT
Built 1950 Load: 8.2 t ADT: 100
COUNTY ROAD 119
FairOver: BR MAIN CANAL 038
5M NE FALLON, Prairie, MT
Built 1936 Load: 8.2 t ADT: 100
DUTCH HENRY RD
FairOver: BEAVER CREEK 073
11M N REDSTONE, Sheridan, MT
Built 1983 Load: 8.2 t ADT: 100
MYERS RD
FairOver: YELLOWSTONE RIVER
MYERS, Treasure, MT
Built 1968 Load: 8.7 t ADT: 95
4-H RD
FairOver: MUSSELSHELL RIVER 008
SE ROUNDUP, Musselshell, MT
Built 1970 Load: 9.0 t ADT: 528
CORINNE TRAIL
FairOver: HORSE PRAIRIE CREEK 043
3M E GRANT, Beaverhead, MT
Built 2022 Load: 9.1 t ADT: 100
COUNTY ROAD 111
FairOver: HORSE PRAIRIE CREEK 031
8M W GRANT, Beaverhead, MT
Built 1920 Load: 9.1 t ADT: 100
CEMETARY RD
FairOver: T AND Y CANAL 065
1M S MILES CITY, Custer, MT
Built 1978 Load: 9.1 t ADT: 551
MAPLE STREET
FairOver: WARM SPRINGS CREEK 011
ANACONDA-MAPLE ST, Deer Lodge, MT
Built 1960 Load: 9.1 t ADT: 100
TEIGEN LOOP
FairOver: MCDONALD CREEK 032
S TEIGEN, Petroleum, MT
Built 2012 Load: 9.1 t ADT: 100
DRY FORK RD
FairOver: NO NAME DITCH 052
4M E WILLIAMS, Pondera, MT
Built 1950 Load: 9.1 t ADT: 54
STOLTZ RD
FairOver: BIRCH CREEK 001
12M W VALIER, Pondera, MT
Built 1976 Load: 9.1 t ADT: 100
E LAKE RD
FairOver: PONDERA COULEE 029
15M W CONRAD, Pondera, MT
Built 1960 Load: 9.1 t ADT: 122
PUMPHOUSE RD
FairOver: IRRIGATION DITCH 006
1M NW HYSHAM, Treasure, MT
Built 1955 Load: 9.1 t ADT: 168
WILSON RD
FairOver: SARPY CREEK 012
22M S HYSHAM, Treasure, MT
Built 1970 Load: 9.1 t
RIVER RD
FairOver: SPRING CREEK 023
3M SE LAUREL, Yellowstone, MT
Built 1969 Load: 9.1 t ADT: 100
2ND AVENUE
FairOver: BIG SPRING CREEK 060
LEWISTOWN-2ND AVE, Fergus, MT
Built 1930 Load: 9.9 t ADT: 100
YANTIC RD
FairOver: RED ROCK COULEE 004
3M NE LOHMAN, Blaine, MT
Built 1933 Load: 10.0 t ADT: 40
COUNTY ROAD 323
FairOver: SNAKE CREEK 048
9M S ZURICH, Blaine, MT
Built 1911 Load: 10.0 t ADT: 100
COTTONWOOD CR RD
FairOver: N COTTONWOOD CREEK 037
17M NW ALZADA, Carter, MT
Built 1938 Load: 10.0 t ADT: 100
HOPP RD
FairOver: EAGLE CREEK 049
20M SE BIG SANDY, Chouteau, MT
Built 1971 Load: 10.0 t ADT: 100
SYCAMORE STREET
FairOver: WARM SPRINGS CREEK 009
ANACONDA-SYCAMORE ST, Deer Lodge, MT
Built 1960 Load: 10.0 t ADT: 448
POOR FARM LOOP
FairOver: BIG SPRING CREEK
1M NW Lewistown, Fergus, MT
Built 1908 Load: 10.0 t ADT: 100
72 BENCH RD
FairOver: WARM SPRINGS CREEK 078
5M N DANVERS, Fergus, MT
Built 1980 Load: 10.0 t ADT: 100
FOREST GROVE RD
FairOver: S FORK MCDONALD CR 070
4M SW GRASSRANGE, Fergus, MT
Built 1982 Load: 10.0 t ADT: 146
SINGLE PINE RD
FairOver: COTTONWOOD CREEK 028
7M SW LEWISTOWN, Fergus, MT
Built 1989 Load: 10.0 t ADT: 100
DURNAM ROAD
FairOver: GALLATIN RIVER
DURNAM BRIDGE, Gallatin, MT
Built 1970 Load: 10.0 t ADT: 99
LOWER COTTONWOOD R
FairOver: COTTONWOOD CREEK 028
5M NE CLYDE PARK, Park, MT
Built 1968 Load: 10.0 t ADT: 100
E LAKE RD
FairOver: LAKE FRANCIS CANAL 075
3M SE VALIER, Pondera, MT
Built 1960 Load: 10.0 t ADT: 122
KINGSTON MINE RD
FairOver: C CANAL 025
1M W VALIER, Pondera, MT
Built 1960 Load: 10.0 t ADT: 100
CAMP CREEK RD
FairOver: PUMPKIN CREEK 021
24M NW BROADUS, Powder River, MT
Built 1915 Load: 10.0 t ADT: 100
HINSDALE N RD
FairOver: BLUFF CREEK 044
27M W OPHEIM, Valley, MT
Built 1973 Load: 10.0 t ADT: 14
BENGOCHEA RD
FairOver: E FK PORCUPINE CREEK 112
20M N NASHUA, Valley, MT
Built 1960 Load: 10.0 t ADT: 100
Showing 751-800 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 |