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)

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

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

SLEEPY HOLLOW LN

Structurally Deficient

Over: PRICKLY PEAR CREEK

3 M S MONTANA CITY, Jefferson, MT

Built 2010 Load: 2.7 t ADT: 100

MCCLELLEAN CK ROAD

Structurally Deficient

Over: MCCLELLAN CREEK

MCCLELLAN, Jefferson, MT

Built 1959 Load: 20.4 t ADT: 40

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