Big Horn County, MT

136 public highway bridges

Big Horn County Bridge Snapshot

Big Horn County, Montana contains 136 public highway bridges in the FHWA National Bridge Inventory. Roughly 25% are rated “Good,” 49.3% “Fair,” 5.1% “Poor,” and 5.1% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in MT are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

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

136
Total Bridges
25%
Good
5.1%
Poor
5.1%
Structurally Deficient

Condition Distribution

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

Related

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial