Mineral County, MT

152 public highway bridges

Mineral County Bridge Snapshot

Mineral County, Montana contains 152 public highway bridges in the FHWA National Bridge Inventory. Roughly 18.4% are rated “Good,” 43.4% “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.

152

Total Bridges

18.4%

Good

9.2%

Poor

9.2%

Structurally Deficient

Condition Distribution

Good

18.4% (28)

Fair

43.4% (66)

Poor

9.2% (14)

SD

9.2% (14)

All Bridges (152)

Sort:

I 90

Over: SEP LOCAL ROAD

1.9M E LOOKOUT PASS, Mineral, MT

Built 1973 ADT: 100

I 90

Over: SEP LOCAL ROAD

5M E LOOKOUT PASS, Mineral, MT

Built 1973 ADT: 100

I 90

Over: INT TAFT

5.6M E LOOKOUT PASS, Mineral, MT

Built 1973 ADT: 100

I 90

Over: SEP RANDOLPH CREEK ROAD

3.7M W SALTESE, Mineral, MT

Built 1973 ADT: 100

I 90

Over: INT SALTESE

SALTESE, Mineral, MT

Built 1973 ADT: 100

I 90

Over: INT HAUGAN

HAUGAN, Mineral, MT

Built 1976 ADT: 100

I 90

Over: INT HAUGAN

HAUGAN, Mineral, MT

Built 1976 ADT: 100

I 90

Over: INT DE BORGIA

DE BORGIA, Mineral, MT

Built 1976 ADT: 100

I 90

Over: INT DE BORGIA

DE BORGIA, Mineral, MT

Built 1976 ADT: 100

I 90

Over: INT HENDERSON

3.1M E DE BORGIA, Mineral, MT

Built 1980 ADT: 147

I 90

Over: INT DREXEL

6.2M E DE BORGIA, Mineral, MT

Built 1980 ADT: 100

I 90 EB

Over: INT DREXEL

6.2M E DE BORGIA, Mineral, MT

Built 1980 ADT: 100

I 90

Over: INT TWO MILE-ST REGIS R

3.7M W ST. REGIS, Mineral, MT

Built 1981 ADT: 100

I 90

Over: INT TWO MILE-ST REGIS R

3.7M W ST. REGIS, Mineral, MT

Built 1981 ADT: 100

I 90

Over: INT ST. REGIS

ST. REGIS, Mineral, MT

Built 1983 ADT: 2,653

I 90

Over: INT ST. REGIS

ST. REGIS, Mineral, MT

Built 1983 ADT: 2,653

I 90

Over: CLARK FORK RVR-RR-LOCAL

0.6M E ST. REGIS, Mineral, MT

Built 1982 ADT: 100

I 90

Over: CLARK FORK RVR-RR-LOCAL

0.6M E ST. REGIS, Mineral, MT

Built 1982 ADT: 100

I 90 EB

Over: SEP RED HILL ROAD

0.6M E ST. REGIS, Mineral, MT

Built 1978 ADT: 100

I 90 WB

Over: SEP RED HILL ROAD

0.6M E ST. REGIS, Mineral, MT

Built 1978 ADT: 100

I 90

Over: INT SLOWAY

3.7M E ST. REGIS, Mineral, MT

Built 1978 ADT: 100

I 90

Over: INT SLOWAY

3.7M E ST. REGIS, Mineral, MT

Built 1978 ADT: 100

I 90 EB

Over: CLARK FORK RVR-LOCAL RD

6.2M E ST. REGIS, Mineral, MT

Built 1982 ADT: 100

I 90 WB

Over: CLARK FORK RVR-LOCAL RD

6.2M E ST. REGIS, Mineral, MT

Built 1984 ADT: 100

I 90 EB

Over: SEP SOUTHSIDE ROAD

6.2M E ST. REGIS, Mineral, MT

Built 1984 ADT: 100

I 90 WB

Over: SEP SOUTHSIDE ROAD

6.2M E ST. REGIS, Mineral, MT

Built 1984 ADT: 100

I 90

Over: INT DRY CREEK

5M W SUPERIOR, Mineral, MT

Built 1983 ADT: 293

I 90

Over: INT DRY CREEK

5M W SUPERIOR, Mineral, MT

Built 1983 ADT: 293

I 90

Over: INT SUPERIOR

SUPERIOR, Mineral, MT

Built 1960 ADT: 3,533

I 90

Over: INT SUPERIOR

SUPERIOR, Mineral, MT

Built 1960 ADT: 3,533

I 90

Over: INT LOZEAU COUNTY ROAD

7.4M E SUPERIOR, Mineral, MT

Built 1967 ADT: 217

I 90

Over: INT LOZEAU COUNTY ROAD

7.4M E SUPERIOR, Mineral, MT

Built 1967 ADT: 217

I 90

Over: INT TARKIO COUNTY ROAD

13.7M W ALBERTON, Mineral, MT

Built 1959 ADT: 100

I 90

Over: INT TARKIO COUNTY ROAD

13.7M W ALBERTON, Mineral, MT

Built 1959 ADT: 100

I 90

Over: SEP ELIZABETH LN

9.9M W ALBERTON, Mineral, MT

Built 1981 ADT: 100

I 90

Over: SEP ELIZABETH LN

9.9M W ALBERTON, Mineral, MT

Built 1965 ADT: 100

I 90

Over: LOCAL-RR

6.2M W ALBERTON, Mineral, MT

Built 1981 ADT: 100

I 90

Over: LOCAL-RR

6.2M W ALBERTON, Mineral, MT

Built 1964 ADT: 100

I 90

Over: INT CYR-CLARK FORK RVR

5M W ALBERTON, Mineral, MT

Built 1981 ADT: 49

I 90

Over: INT CYR-CLARK FORK RVR

5M W ALBERTON, Mineral, MT

Built 1965 ADT: 49

LITTLE JOE CR RD

Over: SEP I 90 005

1M W ST REGIS, Mineral, MT

Built 1983 ADT: 3,180

FISH CREEK RD

Over: INT FISH CREEK-I 90 009

4M E TARKIO, Mineral, MT

Built 1965 ADT: 4,036

LKOUT PSS SKI AREA

Over: INT LKOUT PASS-I 90 004

9M W SALTESE, Mineral, MT

Built 1973 ADT: 3,873

RAILROAD AVE

Over: INT ALBERTON-I 90

ALBERTON-RAILROAD AVE, Mineral, MT

Built 1963 ADT: 4,526

RD 431

Over: ST REGIS RIVER

TWOMILE CR, Mineral, MT

Built 1957 ADT: 50

NO DATA ENTERED

Over: TROUT CREEK

NO DATA ENTERED, Mineral, MT

Built 1950 Load: 7.5 t ADT: 50

LOZEAU CROSSOVR RD

Over: CLARK FORK 045

LOZEAU, Mineral, MT

Built 1944 Load: 15.4 t ADT: 217

I 90

Over: ST. REGIS RVR-LOCAL RD

4.3M E DE BORGIA, Mineral, MT

Built 1979 Load: 16.3 t ADT: 7,352

NO DATA ENTERED

Over: ST REGIS RIVER

NO DATA ENTERED, Mineral, MT

Built 1940 Load: 16.8 t ADT: 50

SOUTHSIDE CROSSING

Over: CLARK FORK 015

N DRY CREEK INT, Mineral, MT

Built 1982 Load: 18.1 t ADT: 293

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 5, 2026