Jefferson County, MT

128 public highway bridges

Jefferson County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Jefferson County, Montana contains 128 public highway bridges. Roughly 10.9% are rated “Good,” 46.9% “Fair,” and 5.5% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

128

Total Bridges

10.9%

Good

46.9%

Fair

5.5%

Poor Condition

Condition Distribution

Good

10.9% (14)

Fair

46.9% (60)

Poor

5.5% (7)

All Bridges (128)

Sort:

I 15

Over: INT WOODVILLE

3.1M N BUTTE, Jefferson, MT

Built 1976 ADT: 100

I 15

Over: INT WOODVILLE

3.1M N BUTTE, Jefferson, MT

Built 1976 ADT: 100

I 15

Over: SEP SAWMILL GULCH

6.2M N BUTTE, Jefferson, MT

Built 1976 ADT: 100

I 15

Over: SEP SAWMILL GULCH

6.2M N BUTTE, Jefferson, MT

Built 1976 ADT: 100

I 15

Over: INT TRASK-LOWLAND RD

8M N BUTTE, Jefferson, MT

Built 1976 ADT: 100

I 15

Over: INT TRASK-LOWLAND RD

8M N BUTTE, Jefferson, MT

Built 1976 ADT: 100

I 15

Over: SEP ELK PARK-E ELK PARK

12.4M N BUTTE, Jefferson, MT

Built 1985 ADT: 100

I 15

Over: SEP ELK PARK-E ELK PARK

12.4M N BUTTE, Jefferson, MT

Built 1985 ADT: 100

I 15

Over: INT BERNICE-BOULDER R RD

5M S BASIN, Jefferson, MT

Built 1985 ADT: 87

I 15

Over: INT BERNICE-BOULDER R RD

5M S BASIN, Jefferson, MT

Built 1985 ADT: 87

I 15

Over: SEP SILVER AVE-BASIN CR

BASIN, Jefferson, MT

Built 1985 ADT: 100

I 15

Over: INT BASIN

BASIN, Jefferson, MT

Built 1985 ADT: 100

I 15

Over: BOULDER RVR-FRONTAGE RD

1.9M E BASIN, Jefferson, MT

Built 1982 ADT: 100

I 15

Over: INT HIGH ORE

3.7M E BASIN, Jefferson, MT

Built 1982 ADT: 100

I 15

Over: SEP GALENA GULCH ROAD

4.3M E BASIN, Jefferson, MT

Built 1981 ADT: 100

I 15

Over: BOULDER RVR-ACCESS RD

2.5M W BOULDER, Jefferson, MT

Built 1980 ADT: 100

I 15

Over: BOULDER RVR-ACCESS RD

2.5M W BOULDER, Jefferson, MT

Built 1980 ADT: 100

I 15

Over: SEP DEPOT HILL ROAD

BOULDER, Jefferson, MT

Built 1973 ADT: 100

I 15

Over: SEP DEPOT HILL ROAD

BOULDER, Jefferson, MT

Built 1973 ADT: 100

I 15

Over: SEP AMAZON RD

3.7M N BOULDER, Jefferson, MT

Built 1973 ADT: 100

I 15

Over: SEP AMAZON ROAD

3.7M N BOULDER, Jefferson, MT

Built 1973 ADT: 100

I 15

Over: SEP TROY CREEK ROAD

3.7M S JEFFERSON CITY, Jefferson, MT

Built 1973 ADT: 100

I 15

Over: SEP TROY CREEK ROAD

3.7M S JEFFERSON CITY, Jefferson, MT

Built 1973 ADT: 100

I 15

Over: INT CLANCY

CLANCY, Jefferson, MT

Built 1969 ADT: 100

I 15

Over: INT CLANCY

CLANCY, Jefferson, MT

Built 1969 ADT: 100

I 15

Over: SEP LUMP GULCH ROAD

0.6M N CLANCY, Jefferson, MT

Built 1969 ADT: 100

I 15

Over: SEP LUMP GULCH ROAD

0.6M N CLANCY, Jefferson, MT

Built 1969 ADT: 100

I 15

Over: SEP S HWY 282

1.9M S MONTANA CITY, Jefferson, MT

Built 1968 ADT: 100

I 15

Over: SEP S HWY 282

1.9M S MONTANA CITY, Jefferson, MT

Built 1968 ADT: 100

I 90

Over: INT PIPESTONE

6.8M W WHITEHALL, Jefferson, MT

Built 1966 ADT: 100

I 90

Over: INT PIPESTONE

6.8M W WHITEHALL, Jefferson, MT

Built 1966 ADT: 100

I 90

Over: SEP SHEEP CAMP RD

3.7M W WHITEHALL, Jefferson, MT

Built 1966 ADT: 100

I 90

Over: SEP SHEEP CAMP RD

3.7M W WHITEHALL, Jefferson, MT

Built 1966 ADT: 100

I 90 EASTBOUND

Over: INT WHITEHALL

WHITEHALL, Jefferson, MT

Built 1966 ADT: 100

I 90 WESTBOUND

Over: INT WHITEHALL

WHITEHALL, Jefferson, MT

Built 1966 ADT: 100

I 90 EASTBOUND

Over: P 69

3.1M W CARDWELL, Jefferson, MT

Built 1968 ADT: 1,002

I 90 WESTBOUND

Over: P 69

3.1M W CARDWELL, Jefferson, MT

Built 1968 ADT: 1,002

I 90

Over: INT CARDWELL-S 359

CARDWELL, Jefferson, MT

Built 1968 ADT: 1,389

I 90

Over: INT CARDWELL-S 359

CARDWELL, Jefferson, MT

Built 1968 ADT: 1,389

I 90

Over: SEP COUNTY ROAD

7.4M E CARDWELL, Jefferson, MT

Built 1969 ADT: 100

HOMESTAKE PASS

Over: INT HOMESTAKE-I 90 005

HOMESTAKE PASS, Jefferson, MT

Built 1966 ADT: 11,082

PAUL GULCH RD

Over: SEP I 90 002

WHITEHALL, Jefferson, MT

Built 1966 ADT: 10,289

MILLIGAN CANYON RD

Over: INT MILLIGAN-I 90 004

11M W CARDWELL, Jefferson, MT

Built 1969 ADT: 5,527

FRONTAGE ROAD 925

Over: INT JEFF CITY-I 15 001

JEFFERSON CITY, Jefferson, MT

Built 1970 ADT: 2,501

S HILLS RD-HWY 282

Over: I-15

1M N MONTANA CITY, Jefferson, MT

Built 1968 ADT: 5,736

S 69

Over: INT BOULDER I 15

BOULDER, Jefferson, MT

Built 1973 ADT: 1,904

S 518

Over: INT MONTANA CITY-I 15

MONTANA CITY, Jefferson, MT

Built 1968 ADT: 5,736

NON MAINTAINED TRL

Over: BISON CREEK

11M N ELK PARK, Jefferson, MT

Built 1984 ADT: 100

NON MAINTAINED TRL

Over: BISON CREEK

12M N ELK PARK, Jefferson, MT

Built 1984 ADT: 100

BOULDER CUT OFF RD

Over: BOULDER RIVER 003

10M NE WHITEHALL, Jefferson, MT

Built 1981 Load: 3.6 t ADT: 100

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

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

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Compiled by PlainBridges, Independent data publisher

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.