Big Horn County, MT

136 public highway bridges

Big Horn County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Big Horn County, Montana contains 136 public highway bridges. Roughly 25% are rated “Good,” 49.3% “Fair,” and 5.1% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

136
Total Bridges
25%
Good
49.3%
Fair
5.1%
Poor Condition

Condition Distribution

Good
25% (34)
Fair
49.3% (67)
Poor
5.1% (7)

All Bridges (136)

IRR - I 90

Fair

Over: SEP LOCAL ROAD

3.7M S LODGE GRASS, Big Horn, MT

Built 1985 Load: 25.4 t ADT: 1,978

IRR - I 90

Fair

Over: SEP LOCAL ROAD

3.7M S LODGE GRASS, Big Horn, MT

Built 1985 Load: 25.4 t ADT: 1,978

WARMAN LOOP

Fair

Over: BIGHORN CANAL 018

3M NE FORT SMITH, Big Horn, MT

Built 1930 Load: 25.4 t ADT: 100

IRR - S 313

Fair

Over: ROTTEN GRASS CREEK

SAINT XAVIER, Big Horn, MT

Built 1983 Load: 25.5 t ADT: 617

IRR - I 90

Fair

Over: LITTLE BIGHORN RIVER

0.6M S CROW AGENCY, Big Horn, MT

Built 1959 Load: 26.3 t ADT: 3,503

IRR - I 90

Fair

Over: SEP COUNTY ROAD

6.8M N LODGE GRASS, Big Horn, MT

Built 1980 Load: 26.3 t ADT: 2,055

IRR - I 90

Fair

Over: SEP COUNTY ROAD

6.8M N LODGE GRASS, Big Horn, MT

Built 1980 Load: 26.3 t ADT: 2,055

IRR - S 73

Fair

Over: LITTLE BIGHORN RIVER

LODGE GRASS, Big Horn, MT

Built 1980 Load: 26.3 t ADT: 641

FORTY MILE RD

Fair

Over: OWL CREEK 085

2M SE LODGE GRASS, Big Horn, MT

Built 2015 Load: 28.5 t ADT: 100

IRR - FRONTAGE 315

Fair

Over: LITTLE BIGHORN RIVER 002

2M S CROW AGENCY, Big Horn, MT

Built 1976 Load: 29.0 t ADT: 100

IRR - US 212

Fair

Over: MUDDY CREEK

5M W LAME DEER, Big Horn, MT

Built 1974 Load: 29.0 t ADT: 2,542

IRR - S 451

Fair

Over: LITTLE BIGHORN RIVER

4M N WYOLA, Big Horn, MT

Built 1950 Load: 29.0 t ADT: 380

IRR - I 90

Fair

Over: SEP LOCAL ROAD

8.7M S LODGE GRASS, Big Horn, MT

Built 1985 Load: 29.9 t ADT: 1,978

IRR - I 90

Fair

Over: SEP LOCAL ROAD

8.7M S LODGE GRASS, Big Horn, MT

Built 1985 Load: 29.9 t ADT: 1,978

TULLOCK CR RD

Fair

Over: TULLOCK CREEK 029

15M NE HARDIN, Big Horn, MT

Built 2006 Load: 29.9 t ADT: 35

IRR - S 451

Fair

Over: LODGE GRASS CREEK

LODGE GRASS, Big Horn, MT

Built 1955 Load: 29.9 t ADT: 536

IRR BIA RTE 73

Fair

Over: ROTTEN GRASS CREEK

7.6 KM SE OF ST XAVIER, Big Horn, MT

Built 1980 Load: 30.0 t ADT: 200

IRR BIA RTE 73

Fair

Over: ROTTEN GRASS CREEK

10.6 KM SE OF ST XAVIER, Big Horn, MT

Built 1980 Load: 30.0 t ADT: 200

IRR BIA RTE 73

Fair

Over: ROTTEN GRASS CREEK

15.3 KM SE OF ST. XAVIER, Big Horn, MT

Built 1986 Load: 30.4 t ADT: 200

IRRC0UNTY ROAD 223

Fair

Over: SOAP CREEK 020

9M SW ST XAVIER, Big Horn, MT

Built 1980 Load: 30.8 t ADT: 100

OLD HWY 87

Fair

Over: RR 025

12M W HARDIN, Big Horn, MT

Built 2006 Load: 30.8 t ADT: 561

IRR - I 90

Fair

Over: RR (NOT IN USE)

HARDIN, Big Horn, MT

Built 1971 Load: 31.8 t ADT: 3,652

IRR - I 90

Fair

Over: RR (NOT IN USE)

HARDIN, Big Horn, MT

Built 1971 Load: 31.8 t ADT: 3,652

PASS CREEK RD

Fair

Over: PASS CREEK 021

5M SE WYOLA, Big Horn, MT

Built 1979 Load: 31.8 t ADT: 108

IRR BIA RTE 91

Fair

Over: BIG HORN RIVER

2.4 KM WEST OF ST. XAVIER, Big Horn, MT

Built 1970 Load: 32.4 t ADT: 360

IRR BIA RTE 24

Fair

Over: ROSEBUD CREEK

0.3 MILES WEST OF ROSEBUD, Big Horn, MT

Built 2019 Load: 32.7 t ADT: 60

W BOEHS RD

Fair

Over: TWO LEGGIN`S CANAL 049

3M NW HARDIN, Big Horn, MT

Built 1996 Load: 32.7 t ADT: 100

COUNTY ROAD 103

Fair

Over: HANGING WOMAN CREEK 056

24M NE DECKER, Big Horn, MT

Built 1986 Load: 32.7 t ADT: 331

I 90

Fair

Over: SEP COUNTY ROAD

21.1M E BILLINGS, Big Horn, MT

Built 1972 Load: 33.6 t ADT: 4,152

I 90

Fair

Over: SEP COUNTY ROAD

21.1M E BILLINGS, Big Horn, MT

Built 1972 Load: 33.6 t ADT: 4,152

OLD HWY 87

Fair

Over: FLY CREEK 090

15M W HARDIN, Big Horn, MT

Built 2002 Load: 33.6 t ADT: 561

IRR - I 90

Fair

Over: LITTLE BIGHORN RIVER

0.6M S CROW AGENCY, Big Horn, MT

Built 1949 Load: 34.7 t ADT: 3,503

IRR - S 451

Fair

Over: LITTLE BIGHORN RIVER

8M S GARRYOWEN INT, Big Horn, MT

Built 1955 Load: 39.0 t ADT: 944

IRR BIA RTE 228

Fair

Over: ROSEBUD CREEK

18 KM WEST OF LAME DEER, Big Horn, MT

Built 1983 Load: 39.4 t ADT: 10

IRR - S 451

Fair

Over: PASS CREEK

4M S WYOLA, Big Horn, MT

Built 1949 Load: 39.9 t ADT: 297

IRR - FRONTAGE 325

Fair

Over: LITTLE BIGHORN RIVER 075

2M S CROW AGENCY, Big Horn, MT

Built 1976 Load: 41.7 t ADT: 100

IRR - S 314

Fair

Over: SQUIRREL CREEK

DECKER, Big Horn, MT

Built 1981 Load: 43.5 t ADT: 837

AFTERBAY ROAD

Fair

Over: BIGHORN RIVER

AT SPILLWAY OF YELLOWTAIL, Big Horn, MT

Built 1976 Load: 45.4 t ADT: 165

COUNTY ROAD 103

Fair

Over: TONGUE RIVER 054

3M NE DECKER, Big Horn, MT

Built 1976 Load: 49.9 t ADT: 331

I 90 FRONTAGE RD

Fair

Over: BIGHORN RIVER

1M E HARDIN, Big Horn, MT

Built 2007 Load: 50.8 t ADT: 1,537

CORPORATION RD

Fair

Over: TWO LEGGIN`S CREEK 035

7M SW HARDIN, Big Horn, MT

Built 1991 Load: 83.5 t ADT: 100

IRR - S 313

Fair

Over: OVERFLOW DITCH

7M SW HARDIN, Big Horn, MT

Built 1988 Load: 89.8 t ADT: 1,049

BATTLEFIELD ROAD

Fair

Over: DEEP COULEE

I-90, EXIT 510, EAST ON U, Big Horn, MT

Built 1938 Load: 99.9 t ADT: 150

I 90

Fair

Over: IRRIGATION CANAL

3.1M S HARDIN, Big Horn, MT

Built 1971 Load: 99.9 t ADT: 8,497

IRR - S 314

Fair

Over: SPRING CREEK

5M N DECKER, Big Horn, MT

Built 1981 Load: 99.9 t ADT: 475

S384

Good

Over: Dry Creek

7M E Hardin, Big Horn, MT

Built 2023 ADT: 199

IRR - I 90

Good

Over: BIGHORN RIVER

HARDIN, Big Horn, MT

Built 1971 Load: 12.6 t ADT: 4,249

IRR - I 90

Good

Over: OWL CREEK

2.5M S LODGE GRASS, Big Horn, MT

Built 1985 Load: 15.4 t ADT: 1,978

TULLOCK CR RD

Good

Over: TULLOCK CREEK 030

20M NE HARDIN, Big Horn, MT

Built 1985 Load: 17.2 t ADT: 35

IRR BIA RTE 8

Good

Over: PRYOR CREEK

1.7 KM WEST OF PRYOR, Big Horn, MT

Built 1997 Load: 23.0 t ADT: 100

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.