Petroleum County, MT

26 public highway bridges

Petroleum County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Petroleum County, Montana contains 26 public highway bridges. Roughly 30.8% are rated “Good,” 53.8% “Fair,” and 15.4% “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.

26
Total Bridges
30.8%
Good
53.8%
Fair
15.4%
Poor Condition

Condition Distribution

Good
30.8% (8)
Fair
53.8% (14)
Poor
15.4% (4)

All Bridges (26)

PETROLIA BENCH RD

Fair

Over: MCDONALD CREEK 003

9M E WINNETT, Petroleum, MT

Built 1940 Load: 5.4 t ADT: 58

MAIN ST

Fair

Over: MCDONALD CREEK 015

WINNETT-MAIN ST, Petroleum, MT

Built 1940 Load: 5.4 t ADT: 98

TEIGEN LOOP

Fair

Over: MCDONALD CREEK 032

S TEIGEN, Petroleum, MT

Built 2012 Load: 9.1 t ADT: 100

CEMETARY RD

Fair

Over: SO FK BUFFALO CR 011

6M NW WINNETT, Petroleum, MT

Built 1960 Load: 11.8 t ADT: 100

S 244

Fair

Over: FLATWILLOW CREEK

6M SW FLATWILLOW, Petroleum, MT

Built 1939 Load: 21.8 t ADT: 207

DOVETAIL VALENTINE

Fair

Over: BUFFALO CREEK 006

6M N WINNETT, Petroleum, MT

Built 1983 Load: 22.7 t ADT: 100

S 244

Fair

Over: DRAINAGE

10M SW FLATWILLOW, Petroleum, MT

Built 1940 Load: 22.7 t ADT: 207

S 244

Fair

Over: MCDONALD CREEK

WINNETT, Petroleum, MT

Built 1941 Load: 22.7 t ADT: 244

S 244

Fair

Over: PIKE CREEK

FLATWILLOW, Petroleum, MT

Built 1939 Load: 23.6 t ADT: 232

S 244

Fair

Over: DRAINAGE

FLATWILLOW, Petroleum, MT

Built 1935 Load: 23.6 t ADT: 232

ROAD 317

Fair

Over: ALKALI CREEK

SECT 1 T18N R29E, Petroleum, MT

Built 1963 Load: 24.5 t ADT: 2

S 200

Fair

Over: BOX ELDER CREEK

8M E WINNETT, Petroleum, MT

Built 1953 Load: 29.9 t ADT: 630

PETROLIA LAKE RD

Fair

Over: MCDONALD CREEK 014

6M E WINNETT, Petroleum, MT

Built 1980 Load: 32.7 t ADT: 100

BLAKESLEE RD

Fair

Over: CANAL 030

7M N TEIGEN, Petroleum, MT

Built 1978 Load: 32.7 t ADT: 100

Flatwillow Road

Good

Over: Flatwilow Creek

12M S Winnett, Petroleum, MT

Built 2023 ADT: 100

DOVETAIL VALENTINE

Good

Over: BOX ELDER CREEK 007

6M N WINNETT, Petroleum, MT

Built 1982 Load: 20.9 t ADT: 100

WELTER DIVIDE RD

Good

Over: BOX ELDER CREEK 010

13M NE TEIGEN, Petroleum, MT

Built 1994 Load: 25.4 t ADT: 100

S 500

Good

Over: FLATWILLOW CREEK

6M SW MOSBY, Petroleum, MT

Built 1962 Load: 26.3 t ADT: 31

S 500

Good

Over: NORTH WILLOW CREEK

13M SW MOSBY, Petroleum, MT

Built 1975 Load: 27.2 t ADT: 33

WILDHORSE RD

Good

Over: BOX ELDER CREEK 012

13M NW WINNETT, Petroleum, MT

Built 1978 Load: 32.7 t ADT: 100

KELLY RD

Good

Over: FLATWILLOW CREEK 013

8M S WINNETT, Petroleum, MT

Built 2013 Load: 34.3 t ADT: 58

HORSE CAMP ROAD

Good

Over: SACAGAWEA RIVER

38 MILES NORTH OF WINNETT, Petroleum, MT

Built 2015 Load: 37.2 t ADT: 100

OLD CAT CREEK RD

Poor

Over: BOX ELDER CREEK 008

5M NE WINNETT, Petroleum, MT

Built 1930 Load: 5.4 t ADT: 100

HUGHES LN

Poor

Over: FLATWILLOW CREEK 016

16M S WINNETT, Petroleum, MT

Built 1950 Load: 10.0 t ADT: 100

ROAD 317

Poor

Over: DRAG CREEK

SECT 11 T18N R29E, Petroleum, MT

Built 1963 Load: 20.9 t ADT: 2

S 244

Poor

Over: YELLOW WATER CR-ELK CR

5M S WINNETT, Petroleum, MT

Built 1948 Load: 29.9 t ADT: 232

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.