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)

I 90 WESTBOUND

Fair

Over: BOULDER RIVER

0.6M E CARDWELL, Jefferson, MT

Built 1968 Load: 40.8 t ADT: 5,527

I 15

Fair

Over: BOULDER RIVER

1.9M S BASIN, Jefferson, MT

Built 1985 Load: 42.6 t ADT: 3,141

US 287

Fair

Over: JEFFERSON RIVER

10M SW THREE FORKS, Jefferson, MT

Built 2001 Load: 44.5 t ADT: 1,204

I 15

Fair

Over: BOULDER RIVER

1.2M S BASIN, Jefferson, MT

Built 1985 Load: 45.4 t ADT: 3,141

CATARACT CREEK RD

Fair

Over: CATARACT CREEK 036

3M N BASIN, Jefferson, MT

Built 1965 Load: 45.4 t ADT: 100

I 15

Fair

Over: BOULDER RIVER

2.5M S BASIN, Jefferson, MT

Built 1985 Load: 46.3 t ADT: 3,141

S 69

Fair

Over: BOULDER RIVER

BOULDER, Jefferson, MT

Built 2003 Load: 53.5 t ADT: 2,960

MERIDIAN ROAD

Good

Over: JEFFERSON RIVER

5M SE THREE FORKS, Jefferson, MT

Built 2023 ADT: 100

QUAINTANCE LN

Good

Over: BOULDER DITCH 029

13M SE BOULDER, Jefferson, MT

Built 2010 Load: 29.8 t ADT: 100

COTTONWOOD RD

Good

Over: BOULDER RIVER 009

1M NE CARDWELL, Jefferson, MT

Built 1983 Load: 32.7 t ADT: 100

TIZER CREEK ROAD

Good

Over: PRICKLY PEAR CREEK 085

3M S JEFFERSON CITY, Jefferson, MT

Built 2005 Load: 32.7 t ADT: 100

HOT SPRINGS ROAD

Good

Over: BIG PIPESTONE CREEK

6M W WHITEHALL, Jefferson, MT

Built 2020 Load: 35.4 t ADT: 100

CATARACT CREEK RD

Good

Over: CATARACT CREEK 071

4M W BASIN, Jefferson, MT

Built 2005 Load: 36.4 t ADT: 100

CATARACT CREEK RD

Good

Over: CATARACT CREEK 072

7M W BASIN, Jefferson, MT

Built 2005 Load: 36.4 t ADT: 100

DUNN LN

Good

Over: BOULDER RIVER 028

20M SE BOULDER, Jefferson, MT

Built 2015 Load: 37.2 t ADT: 100

LUMP GULCH ROAD

Good

Over: PRICKLY PEAR CREEK 074

1M N CLANCY, Jefferson, MT

Built 2007 Load: 41.2 t ADT: 100

I 90 EASTBOUND

Good

Over: BOULDER RIVER

0.6M E CARDWELL, Jefferson, MT

Built 1968 Load: 41.7 t ADT: 5,527

I 15

Good

Over: BOULDER RIVER

4.3M S BASIN, Jefferson, MT

Built 1985 Load: 42.6 t ADT: 1,571

NO DATA ENTERED

Good

Over: HELLS CANYON CREEK

UPPER END OF HELLS CANYON, Jefferson, MT

Built 1998 Load: 44.4 t ADT: 50

I 15

Good

Over: BOULDER RIVER

4.3M S BASIN, Jefferson, MT

Built 1985 Load: 46.3 t ADT: 1,571

JEWETT LN

Good

Over: IRRIGATION CANAL 008

NW WILLOW CREEK, Jefferson, MT

Built 2021 Load: 53.5 t ADT: 100

SLEEPY HOLLOW LN

Poor

Over: PRICKLY PEAR CREEK

3 M S MONTANA CITY, Jefferson, MT

Built 2010 Load: 2.7 t ADT: 100

MCCLELLEAN CK ROAD

Poor

Over: MCCLELLAN CREEK

MCCLELLAN, Jefferson, MT

Built 1959 Load: 20.4 t ADT: 40

MT 55

Poor

Over: FISH CREEK

9M SW WHITEHALL, Jefferson, MT

Built 1953 Load: 22.7 t ADT: 1,799

E ELK PARK RD

Poor

Over: BISON CREEK 016

1M S ELK PARK, Jefferson, MT

Built 1927 Load: 23.6 t ADT: 100

MT HWY 2

Poor

Over: RR 061

4M W WHITEHALL, Jefferson, MT

Built 1932 Load: 24.5 t ADT: 982

I 15 FRONTAGE RD

Poor

Over: CATARACT CREEK 030

1M E BASIN, Jefferson, MT

Built 1933 Load: 26.3 t ADT: 100

I 15 FRONTAGE RD

Poor

Over: BASIN CREEK 041

BASIN, Jefferson, MT

Built 1985 Load: 29.0 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

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.