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
US 12
FairOver: DEEP CREEK
10M E TOWNSEND, Broadwater, MT
Built 2007 Load: 37.2 t ADT: 1,298
S 285
FairOver: TOSTON CANAL
2M W TOSTON, Broadwater, MT
Built 1948 Load: 37.2 t ADT: 314
US 310
FairOver: RR
16M SE BRIDGER, Carbon, MT
Built 2001 Load: 37.2 t ADT: 1,513
PLEVNA ROAD
FairOver: S FORK MILL CREEK 039
20M N EKALAKA, Carter, MT
Built 2013 Load: 37.2 t ADT: 100
I 94
FairOver: TONGUE RIVER
1M S MILES CITY, Custer, MT
Built 1974 Load: 37.2 t ADT: 2,285
I 94
FairOver: RR
NW GLENDIVE, Dawson, MT
Built 1969 Load: 37.2 t ADT: 2,894
I 94
FairOver: RR
NW GLENDIVE, Dawson, MT
Built 1969 Load: 37.2 t ADT: 2,894
SUNNY BANK RD
FairOver: S FK SANDSTONE CREEK 044
9M SE PLEVNA, Fallon, MT
Built 2013 Load: 37.2 t ADT: 100
CABIN CR RD
FairOver: CABIN CREEK 053
24M NW BAKER, Fallon, MT
Built 2012 Load: 37.2 t ADT: 100
I 90
FairOver: ABANDONED RR
THREE FORKS, Gallatin, MT
Built 1969 Load: 37.2 t ADT: 8,465
LONE MOUNTAIN TRL
FairOver: W FORK W GALLATIN 001
2M E BIG SKY, Gallatin, MT
Built 1972 Load: 37.2 t ADT: 9,549
US 20
FairOver: S FORK MADISON RIVER
4M W WEST YELLOWSTONE, Gallatin, MT
Built 2009 Load: 37.2 t ADT: 4,289
IRR - US 2
FairOver: TWO MEDICINE RIVER
E EAST GLACIER, Glacier, MT
Built 2012 Load: 37.2 t ADT: 1,847
MARSHALL CREEK RD
FairOver: FLINT CREEK
1M W PHILIPSBURG, Granite, MT
Built 1956 Load: 37.2 t ADT: 345
S 567-PIPE CR RD
FairOver: PIPE CREEK
11M N LIBBY, Lincoln, MT
Built 1965 Load: 37.2 t ADT: 213
S 243
FairOver: DRAINAGE
1M N SACO, Phillips, MT
Built 2003 Load: 37.2 t ADT: 252
S 243
FairOver: DRAINAGE
1M N SACO, Phillips, MT
Built 2003 Load: 37.2 t ADT: 252
S 243
FairOver: BEAVER CREEK OVERFLOW
1M N SACO, Phillips, MT
Built 2003 Load: 37.2 t ADT: 252
US 212
FairOver: POWDER RIVER
1M SE BROADUS, Powder River, MT
Built 1985 Load: 37.2 t ADT: 2,361
US 212
FairOver: E FK LITTLE POWDER RIVER
8M SE BROADUS, Powder River, MT
Built 1983 Load: 37.2 t ADT: 2,463
US 12
FairOver: LITTLE BLACKFOOT RIVER
GARRISON, Powell, MT
Built 1952 Load: 37.2 t ADT: 1,377
IRR - US 2
FairOver: TULE CREEK
10M E WOLF POINT, Roosevelt, MT
Built 1958 Load: 37.2 t ADT: 2,359
IRR - US 2
FairOver: BIG MUDDY RIVER
5M W CULBERTSON, Roosevelt, MT
Built 2012 Load: 37.2 t ADT: 1,051
IRR - S 13
FairOver: MISSOURI RIVER
6M SE WOLF POINT, Roosevelt, MT
Built 1998 Load: 37.2 t ADT: 1,156
IRR - S 200
FairOver: SEEPAY CREEK
2M SW PERMA, Sanders, MT
Built 1969 Load: 37.2 t ADT: 2,127
S MONTANA ST
FairOver: SILVER BOW CREEK
BUTTE-S MONTANA ST, Silver Bow, MT
Built 1970 Load: 37.2 t ADT: 14,415
9TH RD NE
FairOver: DRAINAGE 057
2M N CORDOVA, Teton, MT
Built 1988 Load: 37.2 t ADT: 100
S 431
FairOver: GREENFIELD MAIN CANAL
3M E FAIRFIELD, Teton, MT
Built 1959 Load: 37.2 t ADT: 283
WHATLEY RD
FairOver: MILK RIVER 071
7M SE GLASGOW, Valley, MT
Built 1998 Load: 37.2 t ADT: 78
S 16TH RD
FairOver: HUNTLEY MAIN CANAL 006
BALLANTINE, Yellowstone, MT
Built 1967 Load: 37.2 t ADT: 1,052
MT HWY 91
FairOver: BEAVERHEAD RIVER
3M SW DILLON, Beaverhead, MT
Built 1945 Load: 37.3 t ADT: 582
S 489
FairOver: SUNDAY CREEK
3M N MILES CITY, Custer, MT
Built 1961 Load: 37.3 t ADT: 762
CEDAR CREEK ROAD
FairOver: CEDAR CREEK
4 MI N OF COLUMBIA FALLS, Flathead, MT
Built 1992 Load: 37.3 t ADT: 10
NO DATA ENTERED
FairOver: HENDERSON CREEK
NO DATA ENTERED, Mineral, MT
Built 1955 Load: 37.3 t ADT: 40
FDR 1278
FairOver: PINTLAR CREEK
NO DATA ENTERED, Beaverhead, MT
Built 1981 Load: 37.6 t ADT: 15
GILLESPIE SLIDEROC
FairOver: CLARK FORK
GILLESPIE-SLIDEROCK, Missoula, MT
Built 1965 Load: 37.6 t ADT: 50
GATEWAY S RD
FairOver: GALLATIN RIVER 020
1M W GALLATIN GATEWAY, Gallatin, MT
Built 2001 Load: 37.7 t ADT: 100
FOREST ROAD
FairOver: RED MEADOW CREEK
1.9 MI W OF NORTH FORK RD, Flathead, MT
Built 1960 Load: 37.9 t ADT: 20
YOUNG CR ROAD
FairOver: YOUNG CR
YOUNG CREEK, Lincoln, MT
Built 1973 Load: 37.9 t ADT: 50
ACCESS ROAD
FairOver: LAYOUT CREEK
FROM N.P. VISITOR CENTER,, Carbon, MT
Built 1983 Load: 38.1 t ADT: 23
HAMMOND RD
FairOver: WHITETAIL CREEK
21M NE HAMMOND, Carter, MT
Built 2010 Load: 38.1 t ADT: 32
N FORK RD
FairOver: RR
COLUMBIA FALLS, Flathead, MT
Built 1972 Load: 38.1 t ADT: 2,407
US 191 FH 42
FairOver: WEST FORK GALLATIN RIVER
2M E BIG SKY, Gallatin, MT
Built 2009 Load: 38.1 t ADT: 8,666
ROCK CREEK RD
FairOver: RANCH CREEK 009
10M S ROCK CREEK INT, Granite, MT
Built 1977 Load: 38.1 t ADT: 592
US 2
FairOver: RR
3M W HAVRE, Hill, MT
Built 1960 Load: 38.1 t ADT: 3,466
HIGH ORE RD
FairOver: BOULDER RIVER 038
3M E BASIN, Jefferson, MT
Built 1980 Load: 38.1 t ADT: 100
S 427
FairOver: OTTER CREEK
1M SE RAYNESFORD, Judith Basin, MT
Built 1957 Load: 38.1 t ADT: 160
US 93
FairOver: MISSION CREEK
ST IGNATIUS, Lake, MT
Built 2006 Load: 38.1 t ADT: 6,822
US 12
FairOver: SOUTH FORK SMITH RIVER
8M S WHITE SULPHUR SPR, Meagher, MT
Built 1997 Load: 38.1 t ADT: 905
US 12
FairOver: COOPER CREEK
5M SE CHECKERBOARD, Meagher, MT
Built 2012 Load: 38.1 t ADT: 341
Showing 2,951-3,000 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 |