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)

RD 506

Fair

Over: ST REGIS RIVER

CLIFF-RAINY CR, Mineral, MT

Built 1954 Load: 18.5 t ADT: 50

I 90

Fair

Over: ST. REGIS RIVER

4.3M W ST. REGIS, Mineral, MT

Built 1981 Load: 20.0 t ADT: 3,180

RD 250

Fair

Over: TROUT CR

PIERCE-SUPERIOR, Mineral, MT

Built 1965 Load: 21.1 t ADT: 50

NO DATA ENTERED

Fair

Over: CEDAR CR

CEDAR CR, Mineral, MT

Built 1935 Load: 21.4 t ADT: 50

I 90 EB

Fair

Over: ST. REGIS RIVER

1.9M W ST. REGIS, Mineral, MT

Built 1981 Load: 21.8 t ADT: 3,180

OLD HWY 10 E

Fair

Over: CLARK FK-RR 060

ST REGIS, Mineral, MT

Built 1942 Load: 21.8 t ADT: 119

RD 388

Fair

Over: HOODOO CREEK

HOODOO CREEK, Mineral, MT

Built 1957 Load: 22.0 t ADT: 50

NO DATA ENTERED

Fair

Over: SILVER CREEK

SILVER CR, Mineral, MT

Built 1984 Load: 23.3 t ADT: 50

RD 810

Fair

Over: ST REGIS RIVER

DOMINION CR, Mineral, MT

Built 1957 Load: 23.3 t ADT: 50

DIAMOND MATCH RD

Fair

Over: RR

3M SE SUPERIOR, Mineral, MT

Built 1955 Load: 23.6 t ADT: 703

I 90

Fair

Over: ST. REGIS RVR-INT RAMP

3.7M W ST. REGIS, Mineral, MT

Built 1981 Load: 24.5 t ADT: 22

MULLAN GULCH RD

Fair

Over: ROCK CREEK 013

HENDERSON, Mineral, MT

Built 1931 Load: 24.5 t ADT: 147

RD 450

Fair

Over: WINDFALL CR

VERDE WINDFALL, Mineral, MT

Built 1967 Load: 24.9 t ADT: 50

I 90

Fair

Over: ST. REGIS RIVER

SALTESE, Mineral, MT

Built 1973 Load: 26.3 t ADT: 7,352

I 90

Fair

Over: CLARK FORK RIVER

1.9M E SUPERIOR, Mineral, MT

Built 1966 Load: 26.3 t ADT: 3,776

I 90

Fair

Over: RR

9.3M W ALBERTON, Mineral, MT

Built 1981 Load: 26.3 t ADT: 4,036

MULLAN GULCH RD

Fair

Over: TWELVEMILE CREEK 014

HENDERSON, Mineral, MT

Built 1931 Load: 26.3 t ADT: 147

I 90

Fair

Over: CLARK FORK RIVER

6.2M E SUPERIOR, Mineral, MT

Built 1967 Load: 26.4 t ADT: 3,776

I 90

Fair

Over: ST. REGIS RIVER

4.3M W ST. REGIS, Mineral, MT

Built 1981 Load: 27.2 t ADT: 3,180

I 90

Fair

Over: ST. REGIS RIVER

4.3M W ST. REGIS, Mineral, MT

Built 1981 Load: 27.2 t ADT: 3,180

RD 352

Fair

Over: TWELVEMILE CREEK

HENDERSON-THOMPSON, Mineral, MT

Built 1955 Load: 27.9 t ADT: 50

I 90

Fair

Over: ST. REGIS RIVER

0.6M W SALTESE, Mineral, MT

Built 1973 Load: 28.1 t ADT: 7,745

I 90

Fair

Over: CLARK FORK RIVER

6.2M E SUPERIOR, Mineral, MT

Built 1967 Load: 28.1 t ADT: 7,551

I 90

Fair

Over: CLARK FORK RIVER

10.5M E SUPERIOR, Mineral, MT

Built 1967 Load: 28.1 t ADT: 3,776

RD 352

Fair

Over: TWELVEMILE CREEK

HENDERSON-THOMPSON, Mineral, MT

Built 1955 Load: 28.2 t ADT: 50

RD 450

Fair

Over: TROUT CR

VERDE WINDFALL, Mineral, MT

Built 1967 Load: 28.2 t ADT: 50

RD 1181

Fair

Over: E FK BIG CREEK

MIDDLE FK BIG CR, Mineral, MT

Built 1954 Load: 28.2 t ADT: 50

I 90 EB

Fair

Over: ST. REGIS RIVER

5.6M E DE BORGIA, Mineral, MT

Built 1980 Load: 29.0 t ADT: 3,676

I 90

Fair

Over: ST. REGIS RIVER

4.3M W ST. REGIS, Mineral, MT

Built 1981 Load: 29.0 t ADT: 3,180

I 90

Fair

Over: ST. REGIS RIVER

ST. REGIS, Mineral, MT

Built 1983 Load: 29.9 t ADT: 3,513

I 90

Fair

Over: CLARK FORK RIVER

10.5M E SUPERIOR, Mineral, MT

Built 1967 Load: 29.9 t ADT: 3,776

PACKER CREEK RD

Fair

Over: ST REGIS RIVER 007

SALTESE, Mineral, MT

Built 1957 Load: 29.9 t ADT: 100

MONTANA CREEK ROAD

Fair

Over: SOUTH FORK FISH CR

MONTANA CREEK ROAD, Mineral, MT

Built 1973 Load: 30.5 t ADT: 50

I 90 EB

Fair

Over: ST. REGIS RIVER

5.6M E DE BORGIA, Mineral, MT

Built 1980 Load: 31.8 t ADT: 3,676

I 90

Fair

Over: ST. REGIS RVR-INT RAMP

ST. REGIS, Mineral, MT

Built 1983 Load: 32.7 t ADT: 442

I 90 WB

Fair

Over: RR

9.3M E SUPERIOR, Mineral, MT

Built 1967 Load: 32.7 t ADT: 3,776

I 90

Fair

Over: RR

9.3M W ALBERTON, Mineral, MT

Built 1965 Load: 32.7 t ADT: 4,036

BIG CREEK RD

Fair

Over: ST REGIS RIVER 019

HAUGAN, Mineral, MT

Built 1972 Load: 32.7 t ADT: 100

PACKER CREEK RD

Fair

Over: PACKER CREEK 008

N SALTESE, Mineral, MT

Built 1957 Load: 32.7 t ADT: 100

I 90

Fair

Over: CLARK FORK RIVER

3.7M W SUPERIOR, Mineral, MT

Built 1982 Load: 33.6 t ADT: 3,615

I 90

Fair

Over: CLARK FORK RIVER

2.5M W SUPERIOR, Mineral, MT

Built 1960 Load: 33.6 t ADT: 3,615

I 90 EB

Fair

Over: RR

9.3M E SUPERIOR, Mineral, MT

Built 1967 Load: 33.6 t ADT: 3,776

I 90

Fair

Over: CLARK FORK RIVER

9.3M W ALBERTON, Mineral, MT

Built 1981 Load: 33.6 t ADT: 4,036

RD 889

Fair

Over: WARD CREEK

WARD CR, Mineral, MT

Built 1960 Load: 34.0 t ADT: 50

RD 342

Fair

Over: DRY CR

DRY CR, Mineral, MT

Built 1959 Load: 34.3 t ADT: 50

RIVER ST N

Fair

Over: CLARK FORK 003

SUPERIOR-RIVER ST N, Mineral, MT

Built 1972 Load: 34.5 t ADT: 2,332

I 90

Fair

Over: ST. REGIS RVR-LOCAL RD

4.3M E DE BORGIA, Mineral, MT

Built 1979 Load: 35.4 t ADT: 7,352

NO DATA ENTERED

Fair

Over: ST REGIS RIVER

NO DATA ENTERED, Mineral, MT

Built 1900 Load: 35.6 t ADT: 50

I 90

Fair

Over: CLARK FORK RIVER

1.9M E SUPERIOR, Mineral, MT

Built 1960 Load: 36.3 t ADT: 3,776

NO DATA ENTERED

Fair

Over: HENDERSON CREEK

NO DATA ENTERED, Mineral, MT

Built 1955 Load: 37.3 t ADT: 40

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