Lake County, MT

111 public highway bridges

Lake County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Lake County, Montana contains 111 public highway bridges. Roughly 56.8% are rated “Good,” 27% “Fair,” and 16.2% “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.

111
Total Bridges
56.8%
Good
27%
Fair
16.2%
Poor Condition

Condition Distribution

Good
56.8% (63)
Fair
27% (30)
Poor
16.2% (18)

All Bridges (111)

FOREST ROAD

Good

Over: CREEK

NORTH FORK LOST CREEK, Lake, MT

Built 2005 Load: 25.9 t ADT: 30

MISSION DAM ROAD

Good

Over: MISSION CREEK

2M E ST IGNATIUS, Lake, MT

Built 2021 Load: 26.3 t ADT: 100

FOREST ROAD

Good

Over: CEDAR CREEK

FATTY-PIPER CONNECTOR, Lake, MT

Built 1985 Load: 26.6 t ADT: 10

KERR DAM RD

Good

Over: IRRIGATION CANAL

2M SW POLSON, Lake, MT

Built 1995 Load: 27.2 t ADT: 2,099

FOREST ROAD

Good

Over: DOG CREEK

NO DATA ENTERED, Lake, MT

Built 2013 Load: 28.2 t ADT: 40

FOREST ROAD

Good

Over: NORTH FORK LOST CREEK

NORTH LOST, Lake, MT

Built 2015 Load: 28.2 t ADT: 40

SYSTEM ROAD

Good

Over: FATTY CREEK

FATTY PIPER CONNECTOR, Lake, MT

Built 2013 Load: 28.8 t ADT: 40

FOREST ROAD

Good

Over: JIM CREEK

PECK LAKE ROAD, Lake, MT

Built 2016 Load: 29.2 t ADT: 50

FOREST ROAD

Good

Over: PIPER CREEK

PIPER CREEK ROAD, Lake, MT

Built 2015 Load: 29.5 t ADT: 40

STASSO ROAD

Good

Over: PABLO CANAL 37A4

5 MILES SOUTH OF POLSON, Lake, MT

Built 2020 Load: 29.9 t ADT: 100

FOREST ROAD

Good

Over: NORTH FORK LOST CREEK

SOUTH LOST, Lake, MT

Built 2014 Load: 30.1 t ADT: 40

STREAM

Good

Over: SOUTH MISSION RESERVIOR

6 MILES EAST ST IGNATIUS, Lake, MT

Built 2019 Load: 30.8 t ADT: 100

IRR BIA RTE 12

Good

Over: MISSION DAM CREEK

3.2KM E OF ST IGNATIUS,MT, Lake, MT

Built 2010 Load: 32.7 t ADT: 30

KAISER RD

Good

Over: PABLO CANAL 031

6M W RONAN, Lake, MT

Built 2014 Load: 32.7 t ADT: 100

MINESINGER TRAIL

Good

Over: PABLO FEEDER CANAL 003

6M SE POLSON, Lake, MT

Built 1978 Load: 32.7 t ADT: 100

COURVILLE TRAIL

Good

Over: PABLO FEEDER CANAL 006

7M SW POLSON, Lake, MT

Built 1978 Load: 32.7 t ADT: 100

US 93

Good

Over: WILDLIFE CROSSING

2M NE RONAN, Lake, MT

Built 2007 Load: 32.7 t ADT: 10,600

US 93

Good

Over: AGRICULTURAL CROSSING

2M N RONAN, Lake, MT

Built 2007 Load: 32.7 t ADT: 10,600

IRR - US 93

Good

Over: PABLO FEEDER CANAL

2M SE POLSON, Lake, MT

Built 2006 Load: 32.7 t ADT: 15,561

N RESEVOIR RD

Good

Over: PABLO FEEDER CANAL 085

5M S POLSON, Lake, MT

Built 2009 Load: 34.5 t ADT: 857

US 93

Good

Over: SABINE CREEK-WILDLIFE

1M S ST IGNATIUS, Lake, MT

Built 2006 Load: 35.4 t ADT: 6,822

LIL BITTERROOT RD

Good

Over: LITTLE BITTERROOT R 063

7M E HOT SPRINGS, Lake, MT

Built 2013 Load: 36.3 t ADT: 100

IRR - US 93

Good

Over: JOCKO RIVER

ARLEE, Lake, MT

Built 2005 Load: 36.3 t ADT: 8,330

S VALLEY CREEK RD

Good

Over: JOCKO RIVER 056

4M NW ARLEE, Lake, MT

Built 2012 Load: 37.2 t ADT: 122

FOREST SYSTEM ROAD

Good

Over: SWAN RIVER

NO DATA ENTERED, Lake, MT

Built 2012 Load: 37.3 t ADT: 50

US 93

Good

Over: WILDLIFE UNDERPASS

1M SE POLSON, Lake, MT

Built 2006 Load: 38.1 t ADT: 7,781

US 93

Good

Over: WILDLIFE UNDERPASS

S OF RAVALLI, Lake, MT

Built 2006 Load: 39.9 t ADT: 8,330

US 93

Good

Over: WILDLIFE UPASS-DRAINAGE

3M N ST IGNATIUS, Lake, MT

Built 2006 Load: 40.8 t ADT: 7,419

MICHAEL RD

Good

Over: PABLO FEEDER CANAL 024

3M NE RONAN, Lake, MT

Built 2014 Load: 41.7 t ADT: 100

US 93

Good

Over: WILDLIFE UNDERPASS

S OF RAVALLI, Lake, MT

Built 2006 Load: 41.7 t ADT: 8,330

HOWLETT ROAD

Good

Over: CROW CREEK

3 M SW RONAN, Lake, MT

Built 2021 Load: 42.6 t ADT: 100

US 93

Good

Over: WILDLIFE UNDERPASS

1M SE POLSON, Lake, MT

Built 2006 Load: 42.6 t ADT: 7,781

US 93

Good

Over: SPRING CREEK

3M S RAVALLI, Lake, MT

Built 2006 Load: 45.4 t ADT: 8,330

MCDONALD LAKE RD

Good

Over: PABLO FEEDER CANAL 077

7M NE ST IGNATIUS, Lake, MT

Built 2004 Load: 46.3 t ADT: 100

US 93

Good

Over: WILDLIFE UPASS-DRAINAGE

1M S RAVALLI, Lake, MT

Built 2006 Load: 46.3 t ADT: 8,330

US 93

Good

Over: WILDLIFE UPASS-RELIEF

1M N RAVALLI, Lake, MT

Built 2006 Load: 52.6 t ADT: 6,822

IRR BIA RTE 1012

Good

Over: NORTH FORK JOCKO RIVER

24.1KM NORTHEAST OF ARLEE, Lake, MT

Built 2003 Load: 66.6 t ADT: 30

US 93

Good

Over: WILDLIFE UPASS-DRAINAGE

1M N ST IGNATIUS, Lake, MT

Built 2006 Load: 76.2 t ADT: 7,419

US 93

Good

Over: WILDLIFE UPASS-DRAINAGE

2M N ST IGNATIUS, Lake, MT

Built 2006 Load: 78.9 t ADT: 7,419

US 93

Good

Over: WILDLIFE UPASS-DRAINAGE

1M N RAVALLI, Lake, MT

Built 2006 Load: 85.3 t ADT: 6,822

FOOTHILL RD

Good

Over: MISSION CREEK 044

2M E ST IGNATIUS, Lake, MT

Built 1988 Load: 87.1 t ADT: 100

US 93

Good

Over: WILDLIFE UPASS-DRAINAGE

2M S ST IGNATIUS, Lake, MT

Built 2006 Load: 99.9 t ADT: 6,822

US 93

Good

Over: WILDLIFE UPASS-DRAINAGE

2M S ST IGNATIUS, Lake, MT

Built 2006 Load: 99.9 t ADT: 6,822

CARBINE RD

Poor

Over: PABLO CANAL 026

4M W PABLO, Lake, MT

Built 1986 Load: 2.7 t ADT: 100

ASHLEY LAKE RD

Poor

Over: PABLO FEEDER CANAL 045

5M NE ST IGNATIUS, Lake, MT

Built 1965 Load: 3.0 t ADT: 100

VALLEY RD

Poor

Over: CROW CREEK 066

10M SW RONAN, Lake, MT

Built 1965 Load: 4.5 t ADT: 100

MOUNTAIN VIEW RD

Poor

Over: PABLO FEEDER CANAL 004

6M SE POLSON, Lake, MT

Built 1982 Load: 4.5 t ADT: 100

PAULSON RD

Poor

Over: PABLO A CANAL 034

5M S POLSON, Lake, MT

Built 1960 Load: 7.3 t ADT: 100

LIL BITTERROOT RD

Poor

Over: LITTLE BITTERROOT R 061

7M NE HOT SPRINGS, Lake, MT

Built 1965 Load: 12.7 t ADT: 100

SEIFERT RD

Poor

Over: PABLO A CANAL 083

6M SW POLSON, Lake, MT

Built 1960 Load: 15.4 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.