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 209
Structurally DeficientOver: ROSEBUD CREEK
8.1 KM WEST OF LAME DEER, Big Horn, MT
Built 1971 Load: 11.3 t ADT: 100
NFSR 839
Structurally DeficientOver: BELT CREEK
8.4 MI. W OF US 89 JCT, Cascade, MT
Built 1954 Load: 12.7 t ADT: 46
FDR 7391
Structurally DeficientOver: NO DATA ENTERED
NO DATA ENTERED, Beaverhead, MT
Built 1987 Load: 14.6 t ADT: 5
NO DATA ENTERED
Structurally DeficientOver: WISE RIVER
SHEEP CR., Beaverhead, MT
Built 1992 Load: 15.2 t ADT: 6
AXTELL ANCENY RD
Structurally DeficientOver: GALLATIN RIVER 084
2M N GALLATIN GATEWAY, Gallatin, MT
Built 1919 Load: 17.2 t ADT: 289
NFSR #487
Structurally DeficientOver: S FK JUDITH RIVER
15 MI. SW OF UTICA, Judith Basin, MT
Built 1958 Load: 18.1 t ADT: 65
CANYON CR ROAD
Structurally DeficientOver: CANYON CR
CANYON CR, Beaverhead, MT
Built 1952 Load: 18.8 t ADT: 50
EKEGREN RD
Structurally DeficientOver: THIRTY MILE CREEK 097
3M E HARLEM, Blaine, MT
Built 1938 Load: 19.0 t ADT: 100
NFSR #487
Structurally DeficientOver: S FK JUDITH RIVER
19 MI. SW OF UTICA, Judith Basin, MT
Built 1958 Load: 19.1 t ADT: 65
384 SPAR LAKE RD.
Structurally DeficientOver: SPAR CR
2.1 MI PAST CAMPGROUND, Lincoln, MT
Built 1955 Load: 20.1 t ADT: 10
MCCLELLEAN CK ROAD
Structurally DeficientOver: MCCLELLAN CREEK
MCCLELLAN, Jefferson, MT
Built 1959 Load: 20.4 t ADT: 40
MILWAUKEE RD
Structurally DeficientOver: YELLOWSTONE RIVER 030
4M SW TERRY, Prairie, MT
Built 1907 Load: 20.9 t ADT: 54
DALTON MNT RD
Structurally DeficientOver: BLACKFOOT RIVER 095
3M W LINCOLN, Lewis and Clark, MT
Built 1956 Load: 21.8 t ADT: 111
FDR 624
Structurally DeficientOver: RUBY CR
RUBY CR, Beaverhead, MT
Built 1952 Load: 22.7 t ADT: 20
US 2
Structurally DeficientOver: LODGE CREEK
CHINOOK, Blaine, MT
Built 1942 Load: 23.6 t ADT: 2,254
IRR ROUTE 46
Structurally DeficientOver: BIG SANDY CREEK
11 KM NNW OF BOX ELDER, Hill, MT
Built 1963 Load: 24.4 t ADT: 100
RD 320
Structurally DeficientOver: CEDAR CR
CEDAR CR, Mineral, MT
Built 1959 Load: 24.6 t ADT: 50
NO DATA ENTERED
Structurally DeficientOver: SWAMP GUL
SWAMP GULCH, Granite, MT
Built 1987 Load: 27.2 t ADT: 50
FDR 211
Structurally DeficientOver: FOUR MILE CREEK
7.8 MI SE US12/FDR211 JCT, Meagher, MT
Built 1973 Load: 27.5 t ADT: 50
ROCK CREEK RD
Structurally DeficientOver: BIG LAKE CREEK 081
4M SW WISDOM, Beaverhead, MT
Built 1958 Load: 32.7 t ADT: 100
S 37 FH 57
Structurally DeficientOver: PINKHAM CREEK
7M S REXFORD, Lincoln, MT
Built 1971 Load: 32.7 t ADT: 601
HWY 91 N
Structurally DeficientOver: BEAVERHEAD RIVER 033
1M N DILLON, Beaverhead, MT
Built 1946 Load: 39.5 t ADT: 2,660
Showing 5,101-5,122 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 |