Prairie County, MT

46 public highway bridges

Prairie County Bridge Snapshot

Prairie County, Montana contains 46 public highway bridges in the FHWA National Bridge Inventory. Roughly 10.9% are rated “Good,” 63% “Fair,” 6.5% “Poor,” and 6.5% 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.

46
Total Bridges
10.9%
Good
6.5%
Poor
6.5%
Structurally Deficient

Condition Distribution

Good
10.9% (5)
Fair
63% (29)
Poor
6.5% (3)
SD
6.5% (3)

All Bridges (46)

I 94

Unknown

Over: SEP MONTANA ROAD

11M SW TERRY, Prairie, MT

Built 1971 ADT: 100

I 94

Unknown

Over: SEP MONTANA ROAD

11M SW TERRY, Prairie, MT

Built 1971 ADT: 100

I 94

Unknown

Over: INT POWDER RIVER

7M SW TERRY, Prairie, MT

Built 1971 ADT: 100

I 94

Unknown

Over: INT POWDER RIVER

7M SW TERRY, Prairie, MT

Built 1971 ADT: 100

CONNS COULEE RD

Unknown

Over: SEP JENS I 94 002

2M SW TERRY, Prairie, MT

Built 1971 ADT: 2,110

FALLON TOWER RD

Unknown

Over: SEP I 94 003

2M NE FALLON, Prairie, MT

Built 1977 ADT: 2,191

FRONTAGE ROAD 168

Unknown

Over: SEP I 94 001

2M SW FALLON, Prairie, MT

Built 1969 ADT: 1,914

TEN MILE RD

Unknown

Over: INT TERRY-I 94

SE TERRY, Prairie, MT

Built 1971 ADT: 2,110

S 340

Unknown

Over: INT FALLON-I 94

FALLON, Prairie, MT

Built 1978 ADT: 1,914

SPRING CREEK RD

Fair

Over: CABIN CREEK 011

13M NE MILDRED, Prairie, MT

Built 1933 Load: 6.4 t ADT: 100

COUNTY ROAD 119

Fair

Over: BR MAIN CANAL 038

5M NE FALLON, Prairie, MT

Built 1936 Load: 8.2 t ADT: 100

S 253

Fair

Over: YELLOWSTONE RIVER

1M NE TERRY, Prairie, MT

Built 1959 Load: 11.8 t ADT: 438

OLD HWY 10 W

Fair

Over: POWDER RIVER 040

6M SW TERRY, Prairie, MT

Built 1945 Load: 12.7 t ADT: 504

OLD HWY 10 E

Fair

Over: O`FALLON CREEK 043

1M W FALLON, Prairie, MT

Built 1948 Load: 16.3 t ADT: 504

OLD HWY 10 E

Fair

Over: RR 046

1M W FALLON, Prairie, MT

Built 1934 Load: 17.2 t ADT: 504

FRONTAGE ROAD 114

Fair

Over: YELLOWSTONE RIVER 015

1M NE FALLON, Prairie, MT

Built 1945 Load: 17.2 t ADT: 100

I 94

Fair

Over: YELLOWSTONE RIVER

1M N FALLON, Prairie, MT

Built 1978 Load: 18.5 t ADT: 2,191

I 94

Fair

Over: YELLOWSTONE RIVER

1M N FALLON, Prairie, MT

Built 1978 Load: 21.4 t ADT: 2,191

I 94

Fair

Over: RR

SW FALLON, Prairie, MT

Built 1977 Load: 22.7 t ADT: 2,191

I 94

Fair

Over: RR

SW FALLON, Prairie, MT

Built 1977 Load: 24.5 t ADT: 1,914

S 253

Fair

Over: BRACKETT CREEK

8M NW TERRY, Prairie, MT

Built 1935 Load: 24.5 t ADT: 402

S 253

Fair

Over: DRAINAGE

18M NW TERRY, Prairie, MT

Built 1940 Load: 26.3 t ADT: 366

OLD HWY 10 W

Fair

Over: WILLIAMS COULEE 007

13M SW TERRY, Prairie, MT

Built 1930 Load: 28.1 t ADT: 504

CB ROUTE RD

Fair

Over: BR MAIN CANAL 037

4M NE FALLON, Prairie, MT

Built 1966 Load: 28.1 t ADT: 80

S 253

Fair

Over: DRAINAGE

17M NW TERRY, Prairie, MT

Built 1940 Load: 28.1 t ADT: 366

S 253

Fair

Over: CEDAR CREEK

22M NW TERRY, Prairie, MT

Built 1947 Load: 29.0 t ADT: 366

S 253

Fair

Over: CEDAR CREEK

9M NW TERRY, Prairie, MT

Built 1935 Load: 31.8 t ADT: 402

OLD HWY 10 W

Fair

Over: DRAINAGE 022

1M SW TERRY, Prairie, MT

Built 1930 Load: 32.7 t ADT: 504

I 94

Fair

Over: RR

3M E TERRY, Prairie, MT

Built 1969 Load: 34.5 t ADT: 1,914

I 94

Fair

Over: RR

3M E TERRY, Prairie, MT

Built 1969 Load: 34.5 t ADT: 1,914

OLD HWY 10 W

Fair

Over: CONN`S COULEE 021

3M SW TERRY, Prairie, MT

Built 1930 Load: 34.5 t ADT: 504

CB ROUTE RD

Fair

Over: BR MAIN CANAL 036

3M NE FALLON, Prairie, MT

Built 1938 Load: 36.3 t ADT: 80

I 94

Fair

Over: O`FALLON CREEK

1M SW FALLON, Prairie, MT

Built 1969 Load: 38.1 t ADT: 1,914

I 94

Fair

Over: POWDER RIVER

7M SW TERRY, Prairie, MT

Built 1971 Load: 39.0 t ADT: 2,110

I 94

Fair

Over: POWDER RIVER

7M SW TERRY, Prairie, MT

Built 1971 Load: 39.0 t ADT: 2,110

S 253

Fair

Over: CHERRY CREEK

4M N TERRY, Prairie, MT

Built 2007 Load: 40.8 t ADT: 438

TEN MILE RD

Fair

Over: COAL CREEK 005

18M S TERRY, Prairie, MT

Built 1987 Load: 76.2 t ADT: 100

I 94

Fair

Over: ASH CREEK

2M E TERRY, Prairie, MT

Built 1969 Load: 99.9 t ADT: 3,828

WHITNEY CREEK RD

Good

Over: O`FALLON CREEK 017

SW MILDRED, Prairie, MT

Built 2003 Load: 35.4 t ADT: 32

CABIN CREEK RD

Good

Over: CABIN CREEK 008

13M NE MILDRED, Prairie, MT

Built 2012 Load: 36.3 t ADT: 100

I 94

Good

Over: O`FALLON CREEK

1M SW FALLON, Prairie, MT

Built 1969 Load: 38.1 t ADT: 1,914

S 340

Good

Over: PLUM COULEE CREEK

1M SE FALLON, Prairie, MT

Built 2020 Load: 39.0 t ADT: 211

CABIN CREEK RD

Good

Over: CABIN CREEK

19M SE FALLON, Prairie, MT

Built 1988 Load: 41.7 t ADT: 27

CB ROUTE RD

Poor

Over: BUFFALO RAPIDS CANAL042

5M NE FALLON, Prairie, MT

Built 1939 Load: 4.5 t ADT: 80

CB ROUTE RD

Poor

Over: BR MAIN CANAL 035

3M NE FALLON, Prairie, MT

Built 1928 Load: 33.6 t ADT: 80

MILWAUKEE RD

Structurally Deficient

Over: YELLOWSTONE RIVER 030

4M SW TERRY, Prairie, MT

Built 1907 Load: 20.9 t ADT: 54

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

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