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
FOYS BEND LN
FairOver: ASHLEY CREEK 003
2M SE KALISPELL, Flathead, MT
Built 2001 Load: 16.5 t ADT: 100
RUBY ROAD
FairOver: MIDDLE FK RUBY RIVE
M FK RUBY RIVER, Madison, MT
Built 1947 Load: 16.5 t ADT: 50
FDR 204
FairOver: MOOSE CREEK
1.3 MI NE RD 119/204 JCT, Meagher, MT
Built 1956 Load: 16.5 t ADT: 50
OLIES RD
FairOver: WOLF CREEK 088
6M E DENTON, Fergus, MT
Built 1983 Load: 16.8 t ADT: 100
NO DATA ENTERED
FairOver: ST REGIS RIVER
NO DATA ENTERED, Mineral, MT
Built 1940 Load: 16.8 t ADT: 50
NO DATA ENTERED
FairOver: VERMILION RIVER
NO DATA ENTERED, Sanders, MT
Built 1956 Load: 16.8 t ADT: 50
FDR 182
FairOver: MINER CR
MINER CR, Beaverhead, MT
Built 1947 Load: 17.2 t ADT: 50
PARADISE VALLEY RD
FairOver: SIX MILE CREEK 028
4M SE CHINOOK, Blaine, MT
Built 1975 Load: 17.2 t ADT: 100
S 323
FairOver: BOX ELDER CREEK
17M SE EKALAKA, Carter, MT
Built 1957 Load: 17.2 t ADT: 314
E HIGHWOOD RD
FairOver: BELT CREEK 002
8M N BELT, Cascade, MT
Built 1935 Load: 17.2 t ADT: 100
CENTRAL AVE
FairOver: BELT CREEK 084
ARMINGTON, Cascade, MT
Built 1938 Load: 17.2 t ADT: 284
15TH ST N-US 87
FairOver: MISSOURI R-RIVERS TRAIL
GREAT FALLS-15TH ST N, Cascade, MT
Built 1962 Load: 17.2 t ADT: 13,743
ROAD 261
FairOver: IRRIGATION CANAL 041
13M SW GLENDIVE, Dawson, MT
Built 1920 Load: 17.2 t ADT: 21
COUNTY ROAD 526
FairOver: N FK BURNS CREEK 062
13M N INTAKE, Dawson, MT
Built 1930 Load: 17.2 t ADT: 100
COUNTY ROAD 532
FairOver: COTTONWOOD CREEK 018
10M E CIRCLE, Dawson, MT
Built 1938 Load: 17.2 t ADT: 100
S 569
FairOver: MILL CREEK 040
4M SE ANACONDA, Deer Lodge, MT
Built 1950 Load: 17.2 t ADT: 562
ERLE LN
FairOver: DOG CREEK 102
SUFFOLK, Fergus, MT
Built 1981 Load: 17.2 t ADT: 100
GOING-TO-THE-SUN R
FairOver: AVALANCHE CREEK
17 miles northeast of U.S, Flathead, MT
Built 1935 Load: 17.2 t ADT: 1,230
OLD US 2 E
FairOver: ABBOT CREEK 063
MARTIN CITY, Flathead, MT
Built 1931 Load: 17.2 t ADT: 100
IRR - US 2
FairOver: BEAR CREEK
5M SE ESSEX, Flathead, MT
Built 1966 Load: 17.2 t ADT: 1,929
IRR - US 2
FairOver: BEAR CREEK
4M SW SUMMIT, Flathead, MT
Built 1966 Load: 17.2 t ADT: 1,929
I 90
FairOver: JEFFERSON RIVER OVERFLOW
THREE FORKS, Gallatin, MT
Built 1969 Load: 17.2 t ADT: 8,465
SIXTEEN MILE ROAD
FairOver: SIXTEEN MILE CREEK 071
2M E MAUDLOW, Gallatin, MT
Built 1954 Load: 17.2 t ADT: 100
PINE BUTTE RD
FairOver: HIGHLINE CANAL 116
6M S BELGRADE, Gallatin, MT
Built 1987 Load: 17.2 t ADT: 100
LITTLE BEAR RD
FairOver: BIG BEAR CREEK 118
4M S GALLATIN GATEWAY, Gallatin, MT
Built 1987 Load: 17.2 t ADT: 100
S 543
FairOver: VAIL CREEK
2M N JORDAN, Garfield, MT
Built 1976 Load: 17.2 t ADT: 77
TEBAY LN
FairOver: JEF RIV OVERFLOW 013
3M W CARDWELL, Jefferson, MT
Built 2003 Load: 17.2 t ADT: 177
S 200
FairOver: DEARBORN RIVER
25M SW SIMMS, Lewis and Clark, MT
Built 1949 Load: 17.2 t ADT: 1,382
DEEP CREEK ROAD
FairOver: DEEP CR
DEEP CR, Lincoln, MT
Built 1958 Load: 17.2 t ADT: 50
SINCLAIR CREEK RD
FairOver: SINCLAIR CREEK 127
2M NE EUREKA, Lincoln, MT
Built 1977 Load: 17.2 t ADT: 100
US 2
FairOver: KOOTENAI RIVER-RR
2M NW TROY, Lincoln, MT
Built 1942 Load: 17.2 t ADT: 2,402
S BOULDER RD
FairOver: UPR S BOULDER RIVER 055
4M S JEFFERSON ISLAND, Madison, MT
Built 2003 Load: 17.2 t ADT: 100
S 200
FairOver: TIMBER CREEK
19M W BROCKWAY, McCone, MT
Built 1939 Load: 17.2 t ADT: 1,012
DEAN CREEK RD
FairOver: MUSSELSHELL RIVER 004
15M SW ROUNDUP, Musselshell, MT
Built 1988 Load: 17.2 t ADT: 100
FORKS RD
FairOver: STINKY CREEK 109
10M NW SACO, Phillips, MT
Built 1988 Load: 17.2 t ADT: 100
S 243
FairOver: WHITEWATER CREEK
10 M NW SACO, Phillips, MT
Built 1976 Load: 17.2 t ADT: 39
WILLIAMS RD
FairOver: NO NAME DITCH 053
WILLIAMS, Pondera, MT
Built 1960 Load: 17.2 t ADT: 54
HILLSIDE RD
FairOver: NO NAME DITCH 049
1M W CONRAD, Pondera, MT
Built 1960 Load: 17.2 t ADT: 100
PRIMROSE RD N
FairOver: PONDERA COULEE 018
4M NE CONRAD, Pondera, MT
Built 1979 Load: 17.2 t ADT: 100
KOHRS ST
FairOver: COTTONWOOD CREEK 065
DEER LODGE-KOHRS ST, Powell, MT
Built 2003 Load: 17.2 t ADT: 100
OLD HWY 10 E
FairOver: RR 046
1M W FALLON, Prairie, MT
Built 1934 Load: 17.2 t ADT: 504
FRONTAGE ROAD 114
FairOver: YELLOWSTONE RIVER 015
1M NE FALLON, Prairie, MT
Built 1945 Load: 17.2 t ADT: 100
GRANTSDALE RD
FairOver: SKALKAHO CR OVERFLOW 040
GRANTSDALE, Ravalli, MT
Built 1935 Load: 17.2 t ADT: 471
IRR - S 344
FairOver: SHEEP CREEK
1M W FROID, Roosevelt, MT
Built 1956 Load: 17.2 t ADT: 196
US 12
FairOver: DRAINAGE
25M NW FORSYTH, Rosebud, MT
Built 1940 Load: 17.2 t ADT: 144
TROUT CREEK RD
FairOver: TROUT CREEK 025
2M W TROUT CREEK, Sanders, MT
Built 1982 Load: 17.2 t ADT: 100
S REDSTONE RD
FairOver: WOLF CREEK 040
12M S REDSTONE, Sheridan, MT
Built 1950 Load: 17.2 t ADT: 64
E BOULDER RD
FairOver: E BOULDER RIVER 034
6M S MCLEOD, Sweet Grass, MT
Built 1971 Load: 17.2 t ADT: 100
7TH LN NE
FairOver: DRAINAGE 128
12M NW POWER, Teton, MT
Built 1978 Load: 17.2 t ADT: 27
1-LANE ROAD
FairOver: WEST FORK ROCK CREEK
11 MILES W. OF RED LODGE, Carbon, MT
Built 1956 Load: 17.5 t ADT: 50
Showing 951-1,000 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 |