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)

VANZANDT RD

Good

Over: TWO LEGGIN`S CANAL 047

1M W HARDIN, Big Horn, MT

Built 1994 Load: 23.6 t ADT: 44

IRR BIA RTE 210

Good

Over: WEST FORK MUDDY CREEK

17.4 KM SW OF LAME DEER, Big Horn, MT

Built 1977 Load: 24.5 t ADT: 80

RAIL RD

Good

Over: TWO LEGGIN'S CANAL

1M SW HARDIN, Big Horn, MT

Built 2021 Load: 24.5 t ADT: 100

PERITSA CREEK RD

Good

Over: TWO LEGGIN`S CANAL 048

1M W HARDIN, Big Horn, MT

Built 2014 Load: 24.5 t ADT: 100

IRR - S 313

Good

Over: TWO LEGGIN CANAL

5M S HARDIN, Big Horn, MT

Built 1989 Load: 24.5 t ADT: 1,049

FRONTAGE ROAD 332

Good

Over: LODGE GRASS CREEK 070

S LODGE GRASS, Big Horn, MT

Built 2015 Load: 25.4 t ADT: 50

BLACK BRIDGE RD

Good

Over: LITTLE BIGHORN RIVER 024

3M SW WYOLA, Big Horn, MT

Built 1998 Load: 26.3 t ADT: 100

SARPY CREEK RD

Good

Over: TULLOCK CREEK

16M E HARDIN, Big Horn, MT

Built 1968 Load: 26.3 t ADT: 199

IRR - I 90

Good

Over: LITTLE BIGHORN RIVER

8M S CROW AGENCY, Big Horn, MT

Built 1980 Load: 28.1 t ADT: 2,055

LITTLE HORN RD

Good

Over: LITTLE BIGHORN RIVER 073

11M SW WYOLA, Big Horn, MT

Built 1996 Load: 28.1 t ADT: 243

IRR - S 314

Good

Over: DAVIS CREEK

3M SW BUSBY, Big Horn, MT

Built 1983 Load: 28.1 t ADT: 386

IRR - S 451

Good

Over: LITTLE BIGHORN RIVER

3M S GARRYOWEN INT, Big Horn, MT

Built 1980 Load: 28.1 t ADT: 944

BACK LOOP RD

Good

Over: LITTLE BIGHORN RIVER 023

1M N WYOLA, Big Horn, MT

Built 1986 Load: 29.9 t ADT: 100

OLD HWY 87

Good

Over: PERITSA CREEK

6M W HARDIN, Big Horn, MT

Built 2020 Load: 30.8 t ADT: 561

IRR - S 451

Good

Over: PASS CREEK

3M S WYOLA, Big Horn, MT

Built 1949 Load: 30.8 t ADT: 297

HWY 463

Good

Over: ROTTEN GRASS CREEK 008

15M SW LODGE GRASS, Big Horn, MT

Built 1966 Load: 31.1 t ADT: 72

IRR BIA RTE 209

Good

Over: ROSEBUD CREEK

8.1 KM WEST OF LAME DEER, Big Horn, MT

Built 1971 Load: 32.7 t ADT: 100

IRR BIA RTE 209

Good

Over: ROSEBUD CREEK

0.4 MILES WEST OF HWY 212, Big Horn, MT

Built 2019 Load: 32.7 t ADT: 100

IRR - S 313

Good

Over: TWO LEGGIN CANAL

7M SW HARDIN, Big Horn, MT

Built 1991 Load: 32.7 t ADT: 1,049

IRR - US 212

Good

Over: ROSEBUD CREEK

BUSBY, Big Horn, MT

Built 1992 Load: 33.6 t ADT: 2,542

S 47

Good

Over: LOW LINE DITCH

5M N HARDIN, Big Horn, MT

Built 1989 Load: 34.0 t ADT: 636

IRR - S 313

Good

Over: WILLIAMS COULEE

1M S HARDIN, Big Horn, MT

Built 2021 Load: 35.4 t ADT: 1,049

LITTLE HORN RD

Good

Over: PASS CREEK 071

1M SW WYOLA, Big Horn, MT

Built 2004 Load: 35.4 t ADT: 243

IRR BIA RTE 73

Good

Over: BIG HORN CANAL

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

Built 1986 Load: 37.2 t ADT: 200

I 90

Good

Over: FLY CREEK

16.8M W HARDIN, Big Horn, MT

Built 1972 Load: 37.2 t ADT: 3,688

I 90

Good

Over: FLY CREEK

16.8M W HARDIN, Big Horn, MT

Built 1972 Load: 38.1 t ADT: 3,688

IRR BIA RTE 1

Good

Over: BIG HORN CANAL

16 KM W OF CROW AGENCY, Big Horn, MT

Built 2001 Load: 38.5 t ADT: 400

IRR BIA RTE 6

Good

Over: LITTLE BIGHORN RIVER

AT CROW AGENCY, Big Horn, MT

Built 1999 Load: 44.5 t ADT: 1,000

IRR - S 313

Good

Over: SOAP CREEK

9M SW ST XAVIER, Big Horn, MT

Built 1963 Load: 49.9 t ADT: 617

SOAP CREEK RD

Poor

Over: BIG HORN CANAL 009

11M SW ST XAVIER, Big Horn, MT

Built 1946 Load: 11.5 t ADT: 63

IRR BIA RTE 205

Poor

Over: UPPER LODGE GRASS CREEK

6.8 KM NW JCT 205 & 418, Big Horn, MT

Built 1994 Load: 13.1 t ADT: 12

OLD HWY 87

Poor

Over: TWO LEGGIN'S CANAL 0

1M W HARDIN, Big Horn, MT

Built 1931 Load: 20.9 t ADT: 561

IRR BIA RTE 226

Poor

Over: BLACK CANYON CREEK

51.5 KM SW OF LODGE GRASS, Big Horn, MT

Built 1965 Load: 30.3 t ADT: 5

BATTLEFIELD ROAD

Poor

Over: MEDICINE TAIL COULEE

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

Built 1938 Load: 83.4 t ADT: 150

RANDALL RD

Structurally Deficient

Over: TWO LEGGIN`S CANAL 015

3M SW HARDIN, Big Horn, MT

Built 1940 Load: 9.1 t ADT: 100

IRR BIA RTE 209

Structurally Deficient

Over: ROSEBUD CREEK

8.1 KM WEST OF LAME DEER, Big Horn, MT

Built 1971 Load: 11.3 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