Jefferson County, MT

128 public highway bridges

Jefferson County Bridge Snapshot

Jefferson County, Montana contains 128 public highway bridges in the FHWA National Bridge Inventory. Roughly 10.9% are rated “Good,” 46.9% “Fair,” 5.5% “Poor,” and 5.5% 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.

128
Total Bridges
10.9%
Good
5.5%
Poor
5.5%
Structurally Deficient

Condition Distribution

Good
10.9% (14)
Fair
46.9% (60)
Poor
5.5% (7)
SD
5.5% (7)

All Bridges (128)

LOWER VALLEY RD -

Fair

Over: BOULDER RIVER 030

13M SE BOULDER, Jefferson, MT

Built 1977 Load: 10.9 t ADT: 100

TEBAY LN

Fair

Over: JEF RIV OVERFLOW 013

3M W CARDWELL, Jefferson, MT

Built 2003 Load: 17.2 t ADT: 177

WHITETAIL RD

Fair

Over: WHITETAIL CREEK

2M N WHITEHALL, Jefferson, MT

Built 1983 Load: 19.0 t ADT: 399

I 15

Fair

Over: BOULDER RIVER

1.2M W BOULDER, Jefferson, MT

Built 1979 Load: 19.1 t ADT: 1,904

NO DATA ENTERED

Fair

Over: BISON CREEK

BERNICE JUNCTION, Jefferson, MT

Built 1986 Load: 19.8 t ADT: 50

I 90

Fair

Over: RR

5.6M W WHITEHALL, Jefferson, MT

Built 1966 Load: 20.0 t ADT: 4,591

I 15

Fair

Over: BOULDER RIVER

1.9M W BOULDER, Jefferson, MT

Built 1980 Load: 20.9 t ADT: 1,904

I 90

Fair

Over: RR

5.6M W WHITEHALL, Jefferson, MT

Built 1966 Load: 21.8 t ADT: 4,591

BASIN ST

Fair

Over: BASIN CREEK 040

BASIN, Jefferson, MT

Built 1931 Load: 22.3 t ADT: 100

MT HWY 2

Fair

Over: BIG PIPESTONE CREEK 062

4M W WHITEHALL, Jefferson, MT

Built 1931 Load: 22.7 t ADT: 579

S 2

Fair

Over: RADER CREEK

7M E PIPESTONE PASS, Jefferson, MT

Built 1931 Load: 22.7 t ADT: 673

S 2

Fair

Over: WHITETAIL CREEK

WHITEHALL, Jefferson, MT

Built 1955 Load: 22.7 t ADT: 1,393

E 1ST STREET

Fair

Over: WHITETAIL CREEK 023

WHITEHALL-E 1ST ST, Jefferson, MT

Built 1984 Load: 23.0 t ADT: 100

GALENA GULCH ROAD

Fair

Over: BOULDER RIVER

I15 HIGH ORE EXIT, Jefferson, MT

Built 1957 Load: 23.3 t ADT: 50

I 15

Fair

Over: ABANDONED RR

0.6M S MONTANA CITY, Jefferson, MT

Built 1969 Load: 24.5 t ADT: 3,739

CATTLE DRIVE RD

Fair

Over: BOULDER RIVER 017

2M W BOULDER, Jefferson, MT

Built 1983 Load: 24.5 t ADT: 100

I 15 FRONTAGE RD

Fair

Over: BISON CREEK 047

4M W BASIN, Jefferson, MT

Built 1985 Load: 24.5 t ADT: 100

MT HWY 2

Fair

Over: BOULDER RIVER 064

1M E CARDWELL, Jefferson, MT

Built 1968 Load: 24.5 t ADT: 385

TEBAY LN

Fair

Over: JEFFERSON RIVER 012

3M W CARDWELL, Jefferson, MT

Built 1986 Load: 24.5 t ADT: 177

S 41

Fair

Over: LITTLE PIPESTONE CREEK

9M E PIPESTONE PASS, Jefferson, MT

Built 1934 Load: 24.5 t ADT: 464

I 15

Fair

Over: BOULDER RIVER

2.5M W BOULDER, Jefferson, MT

Built 1980 Load: 25.4 t ADT: 1,904

BASIN CREEK RD

Fair

Over: BASIN CREEK 032

BASIN, Jefferson, MT

Built 1960 Load: 25.4 t ADT: 100

I 15 FRONTAGE RD

Fair

Over: BOULDER RIVER 046

2M W BASIN, Jefferson, MT

Built 1985 Load: 25.4 t ADT: 100

I 15 FRONTAGE RD

Fair

Over: BOULDER RIVER 042

BASIN, Jefferson, MT

Built 1985 Load: 26.3 t ADT: 100

WHITE BRIDGE RD

Fair

Over: BOULDER RIVER 044

6M SE BOULDER, Jefferson, MT

Built 1979 Load: 26.9 t ADT: 100

WATERLOO RD

Fair

Over: JEFFERSON RIVER

9M NE SILVERSTAR, Jefferson, MT

Built 1961 Load: 27.2 t ADT: 237

I 15

Fair

Over: BOULDER RIVER

4.3M E BASIN, Jefferson, MT

Built 1980 Load: 28.1 t ADT: 3,807

I 15 FRONTAGE RD

Fair

Over: BOULDER RIVER 043

2M W BASIN, Jefferson, MT

Built 1985 Load: 28.1 t ADT: 100

SHAMROCK ROAD

Fair

Over: BOULDER RIVER

2 MI PAST WHITEHOUSE C. G, Jefferson, MT

Built 1980 Load: 28.2 t ADT: 40

GALENA GULCH RD

Fair

Over: BOULDER RIVER 016

4M E BASIN, Jefferson, MT

Built 2003 Load: 29.9 t ADT: 100

I 15

Fair

Over: BOULDER RIVER

2.5M W BOULDER, Jefferson, MT

Built 1980 Load: 30.8 t ADT: 1,904

MT HWY 2

Fair

Over: COLBERT CREEK 063

7M W WHITEHALL, Jefferson, MT

Built 1931 Load: 30.8 t ADT: 579

LEGAL TENDER LN

Fair

Over: PRICKLY PEAR CREEK 070

CLANCY, Jefferson, MT

Built 1976 Load: 32.7 t ADT: 100

RAILROAD WAY

Fair

Over: PRICKLY PEAR CREEK 065

CLANCY, Jefferson, MT

Built 1976 Load: 32.7 t ADT: 100

MCCLELLAN CREEK RD

Fair

Over: MCCLELLAN CREEK 021

MONTANA CITY, Jefferson, MT

Built 1975 Load: 32.7 t ADT: 100

TEBAY LN

Fair

Over: JEFFERSON SLOUGH 014

3M W CARDWELL, Jefferson, MT

Built 1991 Load: 32.7 t ADT: 177

YELLOWSTONE TRAIL

Fair

Over: WHITETAIL CREEK 024

WHITEHALL-YELLOWSTONE TRL, Jefferson, MT

Built 1986 Load: 32.7 t ADT: 100

I 15

Fair

Over: PRICKLY PEAR CREEK

0.6M S CLANCY, Jefferson, MT

Built 1969 Load: 34.0 t ADT: 5,910

CATARACT CREEK RD

Fair

Over: CATARACT CREEK 034

1M N BASIN, Jefferson, MT

Built 1967 Load: 34.4 t ADT: 100

HUBBARD LN

Fair

Over: BOULDER RIVER 031

4M S BOULDER, Jefferson, MT

Built 2001 Load: 35.4 t ADT: 100

S 359

Fair

Over: JEFFERSON RIVER SLOUGH

CARDWELL, Jefferson, MT

Built 1968 Load: 35.4 t ADT: 985

I 15

Fair

Over: PRICKLY PEAR CREEK

1.2M S CLANCY, Jefferson, MT

Built 1969 Load: 36.3 t ADT: 5,910

I 90

Fair

Over: SEP COUNTY ROAD

7.4M E CARDWELL, Jefferson, MT

Built 1969 Load: 36.3 t ADT: 5,527

CATARACT CREEK RD

Fair

Over: CATARACT CREEK 048

3M N BASIN, Jefferson, MT

Built 1939 Load: 36.3 t ADT: 100

HIGH ORE RD

Fair

Over: BOULDER RIVER 038

3M E BASIN, Jefferson, MT

Built 1980 Load: 38.1 t ADT: 100

CATARACT CREEK RD

Fair

Over: CATARACT CREEK 035

2M N BASIN, Jefferson, MT

Built 1965 Load: 39.0 t ADT: 100

I 15 NB

Fair

Over: ABANDONED RR

0.6M S MONTANA CITY, Jefferson, MT

Built 1969 Load: 39.9 t ADT: 3,739

I 15

Fair

Over: BOULDER RIVER

2.5M S BASIN, Jefferson, MT

Built 1985 Load: 40.8 t ADT: 3,141

I 15

Fair

Over: BOULDER RIVER

1.9M S BASIN, Jefferson, MT

Built 1985 Load: 40.8 t ADT: 3,141

I 15

Fair

Over: BOULDER RIVER

1.2M S BASIN, Jefferson, MT

Built 1985 Load: 40.8 t ADT: 3,141

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