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
BILLINGSLEY RD
FairOver: VANDALIA SOUTH CANAL 074
6M W GLASGOW, Valley, MT
Built 1997 Load: 10.0 t ADT: 100
STORM CASTLE ROAD
FairOver: GALLATIN RIVER
STORM CASTLE CREEK, Gallatin, MT
Built 1935 Load: 10.7 t ADT: 99
TOBACCO SIDING RD
FairOver: TOBACCO RIVER 146
6M SE EUREKA, Lincoln, MT
Built 1950 Load: 10.8 t ADT: 100
STONE CREEK RD
FairOver: EAST BENCH CANAL 003
6M NE DILLON, Beaverhead, MT
Built 1962 Load: 10.9 t ADT: 100
HALL RD
FairOver: RED ROCK COULEE 080
6M NW CHINOOK, Blaine, MT
Built 1970 Load: 10.9 t ADT: 42
HALL RD
FairOver: FT. BELKNAP CANAL 08
6M NW CHINOOK, Blaine, MT
Built 1970 Load: 10.9 t ADT: 42
HAMILTON RD
FairOver: E GALLATIN RIVER 076
5M E CENTRAL PARK, Gallatin, MT
Built 1928 Load: 10.9 t ADT: 100
LOWER VALLEY RD -
FairOver: BOULDER RIVER 030
13M SE BOULDER, Jefferson, MT
Built 1977 Load: 10.9 t ADT: 100
TRUNK BUTTE RD
FairOver: NO NAME COULEE 078
7M N WILLIAMS, Pondera, MT
Built 1960 Load: 10.9 t ADT: 100
OLD SHELBY RD
FairOver: PONDERA CANAL 012
5M NW LEDGER, Pondera, MT
Built 1960 Load: 10.9 t ADT: 60
TROUT CREEK RD
FairOver: LITTLE BLACKFOOT R 018
AVON, Powell, MT
Built 1908 Load: 10.9 t ADT: 100
TERLAND RD
FairOver: BRIDGER CREEK 053
5M SE GREYCLIFF, Sweet Grass, MT
Built 1975 Load: 10.9 t ADT: 100
CACHE CREEK RD
FairOver: LITTLE SNAKE CREEK 048
26M N HINSDALE, Valley, MT
Built 1965 Load: 10.9 t ADT: 100
HEAD LN
FairOver: SEVEN MILE CREEK 149
5M NW HELENA, Lewis and Clark, MT
Built 1982 Load: 11.0 t ADT: 352
COTTONWOOD CR RD
FairOver: WILLOW CREEK 020
8M NW ALZADA, Carter, MT
Built 1986 Load: 11.7 t ADT: 100
EKEGREN RD
FairOver: THIRTY MILE CREEK 127
4M E HARLEM, Blaine, MT
Built 1930 Load: 11.8 t ADT: 100
BALLY DOME RD
FairOver: WOLF CREEK 089
7M E DENTON, Fergus, MT
Built 1979 Load: 11.8 t ADT: 100
VALENTINE RD
FairOver: BOX ELDER CREEK 130
8M E ROY, Fergus, MT
Built 1983 Load: 11.8 t ADT: 100
FOREST GROVE RD
FairOver: S FORK MCDONALD CR 046
6M SW GRASSRANGE, Fergus, MT
Built 1986 Load: 11.8 t ADT: 146
OLD FORTSTEELTRAIL
FairOver: STILLWATER RIVER 082
6M NW OLNEY, Flathead, MT
Built 1988 Load: 11.8 t ADT: 138
MONFORTON SCH RD
FairOver: HYALITE CREEK 105
4M W BOZEMAN, Gallatin, MT
Built 1992 Load: 11.8 t ADT: 100
RIVERSIDE RANCH RD
FairOver: JUDITH RIVER 012
3M W HOBSON, Judith Basin, MT
Built 1940 Load: 11.8 t ADT: 100
CEMETARY RD
FairOver: SO FK BUFFALO CR 011
6M NW WINNETT, Petroleum, MT
Built 1960 Load: 11.8 t ADT: 100
S 253
FairOver: YELLOWSTONE RIVER
1M NE TERRY, Prairie, MT
Built 1959 Load: 11.8 t ADT: 438
CHALK BUTTE RD
FairOver: PLENTYWOOD CREEK 009
5M SE OUTLOOK, Sheridan, MT
Built 1970 Load: 11.8 t ADT: 26
2ND LN SE
FairOver: GREENFIELD CANAL 052
2M SE FAIRFIELD, Teton, MT
Built 1966 Load: 11.8 t ADT: 14
S 48TH ST W
FairOver: CANYON CREEK DITCH 085
2M SW BILLINGS, Yellowstone, MT
Built 1981 Load: 11.8 t ADT: 1,146
NFSR 8982
FairOver: N FK TETON RIVER
7 LAZY P, Teton, MT
Built 1967 Load: 12.0 t ADT: 50
IRR - I 90
FairOver: BIGHORN RIVER
HARDIN, Big Horn, MT
Built 1971 Load: 12.6 t ADT: 4,249
LOWREY RD
FairOver: SUN RIVER 062
5M NW SIMMS, Cascade, MT
Built 1960 Load: 12.7 t ADT: 100
BROWN RD
FairOver: SAND COULEE CREEK 088
TRACY, Cascade, MT
Built 1950 Load: 12.7 t ADT: 100
ROAD 244
FairOver: CLEAR CREEK 017
15M SW GLENDIVE, Dawson, MT
Built 1975 Load: 12.7 t ADT: 100
ROAD 229
FairOver: BAD ROUTE CREEK 035
29M SW GLENDIVE, Dawson, MT
Built 1975 Load: 12.7 t ADT: 100
ALTON CUTOFF
FairOver: WOLF CREEK 091
4M E DENTON, Fergus, MT
Built 1979 Load: 12.7 t ADT: 100
IRR - US 2
FairOver: SNOWSLIDE GULCH
1M SE ESSEX, Flathead, MT
Built 1981 Load: 12.7 t ADT: 1,929
IRR - US 89
FairOver: ST MARYS RIVER
2M SE BABB, Glacier, MT
Built 1956 Load: 12.7 t ADT: 2,203
OVERPASS RD
FairOver: S PONDERA COULEE 014
3M N BRADY, Pondera, MT
Built 1982 Load: 12.7 t ADT: 100
HAWKEYE RD
FairOver: PONDERA COULEE 047
10M SW CONRAD, Pondera, MT
Built 1950 Load: 12.7 t ADT: 100
OLD HWY 10 W
FairOver: POWDER RIVER 040
6M SW TERRY, Prairie, MT
Built 1945 Load: 12.7 t ADT: 504
COUNTY ROAD 074
FairOver: LONE TREE CREEK 079
8M NW SIDNEY, Richland, MT
Built 1940 Load: 12.7 t ADT: 100
COUNTY ROAD 434
FairOver: USBR MAIN CANAL 092
1M N CRANE, Richland, MT
Built 1908 Load: 12.7 t ADT: 100
TULLOCK RD
FairOver: WEST BURNT CREEK 019
10M SE BIGHORN, Treasure, MT
Built 1970 Load: 12.7 t ADT: 35
S 117
FairOver: MILK RIVER
1M S NASHUA, Valley, MT
Built 1957 Load: 12.7 t ADT: 476
PINE UNIT RD
FairOver: CEDAR CREEK 010
31M SW WIBAUX, Wibaux, MT
Built 1987 Load: 12.7 t ADT: 100
GILBERT CR. RD.
FairOver: ROCK CR
VALLEY OF THE MOON, Missoula, MT
Built 1975 Load: 13.3 t ADT: 50
LITTLE LAKE CR RD
FairOver: BIG HOLE RIVER 088
3M NW JACKSON, Beaverhead, MT
Built 1974 Load: 13.6 t ADT: 100
KLINDWORTH RD
FairOver: WOODY ISLAND COULEE 134
7M NW HOGELAND, Blaine, MT
Built 1933 Load: 13.6 t ADT: 100
STOCKYARD RD
FairOver: LODGE CREEK 022
2M E CHINOOK, Blaine, MT
Built 2000 Load: 13.6 t ADT: 100
DEADMAN RD
FairOver: N FORK SUNDAY CREEK 011
10M NW MILES CITY, Custer, MT
Built 1913 Load: 13.6 t ADT: 100
HEEB RD
FairOver: BAKER CREEK 080
5M W BELGRADE, Gallatin, MT
Built 1992 Load: 13.6 t ADT: 102
Showing 801-850 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 |