Beaverhead County, MT

217 public highway bridges

Beaverhead County Bridge Snapshot

Beaverhead County, Montana contains 217 public highway bridges in the FHWA National Bridge Inventory. Roughly 20.7% are rated “Good,” 49.3% “Fair,” 9.2% “Poor,” and 9.2% 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.

217

Total Bridges

20.7%

Good

9.2%

Poor

9.2%

Structurally Deficient

Condition Distribution

Good

20.7% (45)

Fair

49.3% (107)

Poor

9.2% (20)

SD

9.2% (20)

All Bridges (217)

Sort:

I 15

Over: INT MONIDA S 509

MONIDA, Beaverhead, MT

Built 1959 ADT: 100

I 15

Over: INT MONIDA S 509

MONIDA, Beaverhead, MT

Built 1981 ADT: 100

I 15

Over: SEP SNOWLINE STOCK LN

2.5M N MONIDA, Beaverhead, MT

Built 1981 ADT: 1

I 15

Over: SEP SNOWLINE STOCK LN

2.5M N MONIDA, Beaverhead, MT

Built 1981 ADT: 1

I 15

Over: INT SNOWLINE STOCK LN

5.6M S LIMA, Beaverhead, MT

Built 1981 ADT: 25

I 15

Over: INT SNOWLINE STOCK LN

5.6M S LIMA, Beaverhead, MT

Built 1981 ADT: 25

I 15

Over: INT LIMA-BAILEY ST

LIMA, Beaverhead, MT

Built 1959 ADT: 1,987

I 15

Over: INT LIMA-BAILEY ST

LIMA, Beaverhead, MT

Built 1980 ADT: 1,987

I 15

Over: SEP GOSMAN LANE

3.7M S DELL, Beaverhead, MT

Built 1967 ADT: 100

I 15

Over: SEP GOSMAN LANE

3.7M S DELL, Beaverhead, MT

Built 1971 ADT: 100

I 15

Over: INT DELL

DELL-MAIN ST, Beaverhead, MT

Built 1971 ADT: 100

I 15

Over: INT DELL

DELL-MAIN ST, Beaverhead, MT

Built 1971 ADT: 100

I 15

Over: INT KIDD

5.6M N DELL-KIDD LN, Beaverhead, MT

Built 1971 ADT: 100

I 15

Over: INT KIDD

5.6M N DELL-KIDD LN, Beaverhead, MT

Built 1971 ADT: 100

I 15

Over: INT RED ROCK-RED ROCK RD

7.4M S CLARK CANYON DAM, Beaverhead, MT

Built 1971 ADT: 100

I 15

Over: INT RED ROCK-RED ROCK RD

7.4M S CLARK CANYON DAM, Beaverhead, MT

Built 1971 ADT: 100

I 15

Over: SEP ROE LN

6.2M S CLARK CANYON DAM, Beaverhead, MT

Built 1962 ADT: 4

I 15

Over: SEP ROE LN

6.2M S CLARK CANYON DAM, Beaverhead, MT

Built 1980 ADT: 4

I 15

Over: BEAVERHD R-HIGH BRDG RD

1.2M N CLARK CANYON DAM, Beaverhead, MT

Built 1964 ADT: 100

I 15

Over: BEAVERHD R-HIGH BRDG RD

1.2M N CLARK CANYON DAM, Beaverhead, MT

Built 1981 ADT: 100

I 15

Over: SEP HIGH BRIDGE RD

3.7M N CLARK CANYON DAM, Beaverhead, MT

Built 1986 ADT: 100

I 15

Over: SEP HIGH BRIDGE RD

3.7M N CLARK CANYON DAM, Beaverhead, MT

Built 1986 ADT: 100

I 15

Over: SEP HIGH BRIDGE RD

6.2M N CLARK CANYON DAM, Beaverhead, MT

Built 1988 ADT: 100

I 15

Over: SEP HIGH BRDGE RD

6.2M N CLARK CANYON DAM, Beaverhead, MT

Built 1988 ADT: 100

I 15

Over: INT GRASSHOPPER CREEK

8M N CLARK CANYON DAM, Beaverhead, MT

Built 1988 ADT: 100

I 15

Over: INT GRASSHOPPER CREEK

8M N CLARK CANYON DAM, Beaverhead, MT

Built 1988 ADT: 100

I 15

Over: INT BARRETTS-REBICH LN

7.4M S DILLON, Beaverhead, MT

Built 1965 ADT: 100

I 15

Over: INT BARRETTS-REBICH LN

7.4M S DILLON, Beaverhead, MT

Built 1980 ADT: 100

I 15

Over: INT JACKSON-HWY 278

3.7M S DILLON, Beaverhead, MT

Built 1982 ADT: 1,144

I 15

Over: INT JACKSON-HWY 278

3.7M S DILLON, Beaverhead, MT

Built 1982 ADT: 1,144

I 15

Over: SEP PARK STREET

DILLON, Beaverhead, MT

Built 1983 ADT: 100

I 15

Over: SEP PARK STREET

DILLON, Beaverhead, MT

Built 1983 ADT: 100

I 15

Over: INT APEX-BIRCH CR RD

11.2M N DILLON, Beaverhead, MT

Built 1973 ADT: 30

I 15

Over: INT APEX-BIRCH CR RD

11.2M N DILLON, Beaverhead, MT

Built 1973 ADT: 30

I 15

Over: SEP COUNTY RD 203

11.2M S MELROSE, Beaverhead, MT

Built 1973 ADT: 100

I 15

Over: SEP COUNTY RD 203

11.2M S MELROSE, Beaverhead, MT

Built 1973 ADT: 100

I 15

Over: INT ROCK CR-BROWNES BR R

8M S MELROSE, Beaverhead, MT

Built 1973 ADT: 146

I 15

Over: INT ROCK CR-BROWNES BR R

8M S MELROSE, Beaverhead, MT

Built 1973 ADT: 146

FRYING PAN RD

Over: SEP I 15 126

3M N DILLON, Beaverhead, MT

Built 1973 ADT: 1,996

LOVERS LEAP RD

Over: SEP I 15 12

1M N DILLON, Beaverhead, MT

Built 1973 ADT: 1,996

BOND RD

Over: SEP I 15 12

7M N DILLON, Beaverhead, MT

Built 1973 ADT: 3,991

S 89

Over: INT SOUTH DILLON I 15

DILLON, Beaverhead, MT

Built 1983 ADT: 2,826

S 89

Over: LOCAL-BLACKTAIL CR-RR

DILLON, Beaverhead, MT

Built 1974 ADT: 2,660

S 89

Over: INT NORTH DILLON I 15

DILLON, Beaverhead, MT

Built 1973 ADT: 2,602

S 324

Over: INT HORSE PRAIRIE I 15

1M E CLARK CANYON DAM, Beaverhead, MT

Built 1962 ADT: 2,089

BAILEY ST

Over: JUNCTION CREEK

LIMA, Beaverhead, MT

Built 1988 ADT: 174

NO DATA ENTERED

Over: WISE RIVER

NO DATA ENTERED, Beaverhead, MT

Built 1984 ADT: 4

BRUNDAGE LN

Over: RED ROCK RIVER 052

25M NE MONIDA, Beaverhead, MT

Built 1920 Load: 2.7 t ADT: 100

LOWER N FORK RD

Over: N FK BIG HOLE RIVER 069

6M N WISDOM, Beaverhead, MT

Built 1980 Load: 4.5 t ADT: 44

UPPER N FORK RD

Over: N FK BIG HOLE RIVER 063

6M NW WISDOM, Beaverhead, MT

Built 1978 Load: 4.5 t ADT: 100

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

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026