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)

YENNE POINT RD

Fair

Over: DRAIN TO WOODS BAY 103

WOODS BAY, Lake, MT

Built 2008 Load: 14.2 t ADT: 100

GLOVER RD

Fair

Over: PABLO 3A CANAL 037

4M S POLSON, Lake, MT

Built 1985 Load: 19.1 t ADT: 462

KOPP RD

Fair

Over: LITTLE BITTERROOT RV 062

8M NE HOT SPRINGS, Lake, MT

Built 1955 Load: 19.1 t ADT: 100

FISH HATCHERY RD

Fair

Over: POST CREEK 075

4M N ST IGNATIUS, Lake, MT

Built 1920 Load: 20.0 t ADT: 100

IRR - US 93

Fair

Over: FLATHEAD RIVER

POLSON, Lake, MT

Built 1966 Load: 20.0 t ADT: 8,324

TERRACE LAKE RD

Fair

Over: PABLO FEEDER CANAL 022

2M E RONAN, Lake, MT

Built 2009 Load: 21.8 t ADT: 100

TERRACE LAKE RD

Fair

Over: N CROW CREEK 021

1M E RONAN, Lake, MT

Built 1965 Load: 23.6 t ADT: 100

JOCKO CANYON RD

Fair

Over: JOCKO RIVER 012

7M E ARLEE, Lake, MT

Built 1976 Load: 24.5 t ADT: 100

N VALLEY CREEK RD

Fair

Over: VALLEY CREEK 055

3M S RAVALLI, Lake, MT

Built 1960 Load: 24.5 t ADT: 451

IRR - US 93

Fair

Over: POST CREEK

6M N ST IGNATIUS, Lake, MT

Built 1933 Load: 27.2 t ADT: 7,072

IRR - US 93

Fair

Over: DAYTON CREEK

DAYTON, Lake, MT

Built 1987 Load: 27.2 t ADT: 4,951

OLD US HWY 93

Fair

Over: MUD CREEK 097

4M N RONAN, Lake, MT

Built 2007 Load: 28.1 t ADT: 100

S 83 FH 15

Fair

Over: LOST CREEK

3M S SWAN LAKE, Lake, MT

Built 1953 Load: 28.1 t ADT: 1,166

BEAVERHEAD DR

Fair

Over: CROW CREEK 071

3M S RONAN, Lake, MT

Built 2003 Load: 29.0 t ADT: 100

IRR - S 212

Fair

Over: MISSION CREEK

MOIESE, Lake, MT

Built 1959 Load: 29.0 t ADT: 905

IRR - S 200

Fair

Over: JOCKO RIVER-RR

RAVALLI, Lake, MT

Built 1998 Load: 30.8 t ADT: 1,902

N VALLEY CREEK RD

Fair

Over: JOCKO RIVER 054

2M S RAVALLI, Lake, MT

Built 1970 Load: 32.7 t ADT: 451

N CROW RD

Fair

Over: PABLO FEEDER CANAL 007

3M SE PABLO, Lake, MT

Built 1978 Load: 32.7 t ADT: 100

S FERNDALE DR

Fair

Over: SWAN RIVER 102

2M SE FERNDALE, Lake, MT

Built 2007 Load: 34.5 t ADT: 100

THERESA ADAMS LN

Fair

Over: JOCKO RIVER 057

2M E ARLEE, Lake, MT

Built 1978 Load: 35.4 t ADT: 100

US 93

Fair

Over: MISSION CREEK

ST IGNATIUS, Lake, MT

Built 2006 Load: 38.1 t ADT: 6,822

US 93

Fair

Over: GRADE SEPARATION

2M N RAVALLI, Lake, MT

Built 2006 Load: 39.0 t ADT: 6,822

S 83 FH 15

Fair

Over: GOAT CREEK

12M S SWAN LAKE, Lake, MT

Built 2004 Load: 39.0 t ADT: 1,166

US 93

Fair

Over: JOCKO RIVER SIDE CHANNEL

7.5M N ARLEE, Lake, MT

Built 2006 Load: 39.9 t ADT: 8,330

FOREST ROAD

Fair

Over: SWAN RIVER

PORCUPINE CREEK ROAD, Lake, MT

Built 1956 Load: 40.8 t ADT: 20

OLD US HWY 93

Fair

Over: DAYTON CREEK 105

DAYTON, Lake, MT

Built 1930 Load: 41.7 t ADT: 100

US 93

Fair

Over: MUD CREEK

4M N RONAN, Lake, MT

Built 2008 Load: 59.9 t ADT: 5,692

US 93

Fair

Over: MUD CREEK

4M N RONAN, Lake, MT

Built 2007 Load: 63.5 t ADT: 5,692

JOCKO CANYON ROAD

Fair

Over: JOCKO RIVER 015

11M NE ARLEE, Lake, MT

Built 2003 Load: 77.8 t ADT: 100

EAGLE PASS TRAIL

Fair

Over: S KICKING HORSE RES 010

6M SE RONAN, Lake, MT

Built 1991 Load: 99.9 t ADT: 100

US 93

Good

Over: WILDLIFE CROSSING

2 MILES NORTH OF RONAN, Lake, MT

Built 2007 ADT: 10,600

Foothill Road

Good

Over: Mission Res Inlet 043

6 M SE St ignatius, Lake, MT

Built 2023 ADT: 100

MOLLMAN PASS TRAIL

Good

Over: N KICKING HORSE RES 009

4M S RONAN, Lake, MT

Built 2023 ADT: 100

HILLSIDE ROAD

Good

Over: POST CREEK

7 M SOUTH RONAN, Lake, MT

Built 2023 ADT: 100

GARCON GULCH ROAD

Good

Over: LITTLE BITTERROOT RIVER

7 M N HOT SPRINGS, Lake, MT

Built 2022 Load: 13.6 t ADT: 100

SKYLINE DR

Good

Over: PABLO 3A CANAL 039

3M S POLSON, Lake, MT

Built 2015 Load: 14.5 t ADT: 100

OLD FREIGHT ROAD

Good

Over: MISSION CREEK 105

2M NW ST IGNATIUS, Lake, MT

Built 2012 Load: 14.9 t ADT: 100

MCDONALD LAKE RD

Good

Over: POST CREEK 078

6M N ST IGNATIUS, Lake, MT

Built 2015 Load: 15.4 t ADT: 100

NO DATA ENTERED

Good

Over: ARCHIBALD CR

NO DATA ENTERED, Lake, MT

Built 2004 Load: 19.8 t ADT: 50

SKYLINE DR

Good

Over: PABLO FEEDER CANAL 040

2M SE POLSON, Lake, MT

Built 2011 Load: 19.9 t ADT: 100

JOCKO CANYON RD

Good

Over: JOCKO RIVER 013

9M E ARLEE, Lake, MT

Built 1930 Load: 21.4 t ADT: 100

NFSR

Good

Over: PONY CREEK

CONDON AREA, Lake, MT

Built 2008 Load: 21.7 t ADT: 40

BUFFALO BRIDGE RD

Good

Over: FLATHEAD RIVER 084

10M W POLSON, Lake, MT

Built 1993 Load: 21.8 t ADT: 100

SKYLINE DR

Good

Over: PABLO 3A CANAL 038

4M S POLSON, Lake, MT

Built 2013 Load: 21.8 t ADT: 100

NFSR

Good

Over: CAT CREEK

CONDON AREA, Lake, MT

Built 2008 Load: 22.7 t ADT: 40

IRR BIA RTE 1114

Good

Over: JOCKO RIVER

14.5 KM EAST OF ARLEE, Lake, MT

Built 1996 Load: 24.5 t ADT: 75

EAST POST CREEK RD

Good

Over: POST CREEK 080

5 MI N OF ST IGNATIUS, Lake, MT

Built 2022 Load: 24.5 t ADT: 100

CANYON MILL RD

Good

Over: PABLO FEEDER CANAL 008

2M NW RONAN, Lake, MT

Built 2014 Load: 24.5 t ADT: 100

SALMON PRAIRIE RD

Good

Over: SWAN RIVER 091

22M S SWAN LAKE, Lake, MT

Built 1986 Load: 24.5 t ADT: 100

HILLSIDE ROAD

Good

Over: MISSION CREEK

1.5 MILES E. ST. IGNATIUS, Lake, MT

Built 2021 Load: 25.4 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.