Granite County, MT

73 public highway bridges

Granite County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Granite County, Montana contains 73 public highway bridges. Roughly 31.5% are rated “Good,” 42.5% “Fair,” and 11% “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.

73

Total Bridges

31.5%

Good

42.5%

Fair

11%

Poor Condition

Condition Distribution

Good

31.5% (23)

Fair

42.5% (31)

Poor

11% (8)

All Bridges (73)

Sort:

I 90

Over: INT BEARMOUTH

BEARMOUTH, Granite, MT

Built 1970 ADT: 47

I 90

Over: INT BEARMOUTH

BEARMOUTH, Granite, MT

Built 1970 ADT: 267

I 90

Over: SEP BEARMOUTH ROAD

10.5M W DRUMMOND, Granite, MT

Built 1970 ADT: 128

I 90

Over: INT W DRUMMOND

DRUMMOND, Granite, MT

Built 1966 ADT: 1,478

I 90

Over: INT W DRUMMOND

DRUMMOND, Granite, MT

Built 1966 ADT: 1,478

I 90

Over: SEP EDWARDS GULCH ROAD

DRUMMOND, Granite, MT

Built 1966 ADT: 298

I 90

Over: SEP EDWARDS GULCH ROAD

DRUMMOND, Granite, MT

Built 1966 ADT: 298

I 90

Over: INT E DRUMMOND

DRUMMOND, Granite, MT

Built 1966 ADT: 51

I 90

Over: INT E DRUMMOND

DRUMMOND, Granite, MT

Built 1966 ADT: 51

I 90

Over: SEP S-271

1.2M E DRUMMOND, Granite, MT

Built 1966 ADT: 274

I 90

Over: SEP S-271

1.2M E DRUMMOND, Granite, MT

Built 1966 ADT: 274

NO DATA ENTERED

Over: FLINT CREEK

5 MI. N. OF P-BURG ON HWY, Granite, MT

Built 2001 Load: 20.1 t ADT: 50

GRIZZLE CAMP RD

Over: RANCH CR

GRIZZLY CAMP, Granite, MT

Built 1958 Load: 20.1 t ADT: 50

UPPER ROCK CR RD

Over: STONY CREEK 011

19M W PHILLIPSBURG, Granite, MT

Built 1999 Load: 20.1 t ADT: 592

FRONTAGE ROAD 153

Over: CLARK FORK RIVER 034

14M W DRUMMOND, Granite, MT

Built 1970 Load: 20.1 t ADT: 267

NO DATA ENTERED

Over: HOGBACK CREEK

NO DATA ENTERED, Granite, MT

Built 2008 Load: 21.1 t ADT: 50

MANY GLACIER ROAD

Over: WINDY CREEK

8.8 miles west of U.S. Ro, Granite, MT

Built 1931 Load: 21.8 t ADT: 452

S 1

Over: FLINT CREEK

4M N MAXVILLE, Granite, MT

Built 1931 Load: 23.6 t ADT: 1,123

S 1

Over: FRED BURR CREEK

2M S PHILIPSBURG, Granite, MT

Built 1931 Load: 24.5 t ADT: 1,663

NO DATA ENTERED

Over: COPPER CR

AFTER COPPER CREEK CG, Granite, MT

Built 1956 Load: 24.6 t ADT: 50

I 90

Over: CLARK FORK RIVER

0.6M W BEARMOUTH, Granite, MT

Built 1970 Load: 25.4 t ADT: 11,108

S 1

Over: BOULDER CREEK

MAXVILLE, Granite, MT

Built 1986 Load: 25.4 t ADT: 1,123

NO DATA ENTERED

Over: MIDDLE FORK ROCK CR

AT JUNCTION TO MOOSE LAKE, Granite, MT

Built 1956 Load: 25.9 t ADT: 50

MULLAN RD E

Over: FLINT CREEK 001

2M S DRUMMOND, Granite, MT

Built 1998 Load: 26.3 t ADT: 100

GOLD COIN ROAD

Over: FLINT CREEK 017

13M S DRUMMOND, Granite, MT

Built 1984 Load: 26.3 t ADT: 100

MAIN ST

Over: BERGMAN SLOUGH 019

DRUMMOND-MAIN STREET, Granite, MT

Built 1934 Load: 29.9 t ADT: 544

S 1

Over: WILLOW CREEK

4M S DRUMMOND, Granite, MT

Built 1999 Load: 29.9 t ADT: 1,260

NO DATA ENTERED

Over: ROSS FORK

ROSS FORK, Granite, MT

Built 1962 Load: 30.5 t ADT: 50

NO DATA ENTERED

Over: SPILLWAY

SPILLWAY, Granite, MT

Built 1958 Load: 30.8 t ADT: 50

NO DATA ENTERED

Over: MIDDLE FORK ROCK CR

MIDDLE FORK ROCK CR, Granite, MT

Built 1965 Load: 31.1 t ADT: 40

NO DATA ENTERED

Over: WEST FORK ROCK CR

WEST FORK ROCK CR, Granite, MT

Built 1965 Load: 32.7 t ADT: 50

S 1

Over: ABANDONED RAILROAD

DRUMMOND, Granite, MT

Built 1966 Load: 32.7 t ADT: 1,329

NO DATA ENTERED

Over: GOLD CREEK

JACKSON PARK ROAD, Granite, MT

Built 1975 Load: 33.0 t ADT: 40

NO DATA ENTERED

Over: ROSS FORK

ROSS FORK, Granite, MT

Built 1961 Load: 34.0 t ADT: 40

NO DATA ENTERED

Over: MIDDLE FORK ROCK CR

BEFORE KAISER LAKE, Granite, MT

Built 1965 Load: 35.0 t ADT: 40

NO DATA ENTERED

Over: WEST FORK ROCK CR

WEST FORK ROCK CR, Granite, MT

Built 1969 Load: 35.3 t ADT: 40

NO DATA ENTERED

Over: BOWLES CR

BOWLES CR, Granite, MT

Built 1971 Load: 35.3 t ADT: 50

S 1

Over: RR

DRUMMOND, Granite, MT

Built 1966 Load: 35.4 t ADT: 1,329

NO DATA ENTERED

Over: ROSS FORK

ROSS FORK, Granite, MT

Built 1967 Load: 35.6 t ADT: 50

MARSHALL CREEK RD

Over: FLINT CREEK

1M W PHILIPSBURG, Granite, MT

Built 1956 Load: 37.2 t ADT: 345

ROCK CREEK RD

Over: RANCH CREEK 009

10M S ROCK CREEK INT, Granite, MT

Built 1977 Load: 38.1 t ADT: 592

ROAD 5156

Over: UPPER WILLOW CR

UPPER WILLOW CR, Granite, MT

Built 1968 Load: 42.1 t ADT: 40

WALBERG RANCH LN

Over: ROCK CREEK 054

25M W PHILLIPSBURG, Granite, MT

Built 1987 Load: 11.7 t ADT: 592

BLACK PINE ROAD

Over: FLINT CREEK 007

2M NW PHILLIPSBURG, Granite, MT

Built 1991 Load: 19.1 t ADT: 100

MAXVILLE RD

Over: BOULDER CREEK 014

1M S MAXVILLE, Granite, MT

Built 2012 Load: 23.7 t ADT: 100

METESH LANE

Over: FLINT CREEK 055

5M SW PHILLIPSBURG, Granite, MT

Built 2009 Load: 25.4 t ADT: 100

ROSS FORK ROAD

Over: MIDDLE FORK ROCK CR 021

15M SW PHILLIPSBURG, Granite, MT

Built 1991 Load: 27.2 t ADT: 100

MULLAN RD E

Over: FLINT CREEK OVERFLOW 084

2M S DRUMMOND, Granite, MT

Built 1998 Load: 28.1 t ADT: 100

4638: SCOTCHMAN GU

Over: UPPER WILLOW CREEK

14 mi W of MT1/US10A, Granite, MT

Built 1980 Load: 28.5 t ADT: 25

N SANDIN RANCH LN

Over: MIDDLE FORK ROCK CR 032

15M SW PHILLIPSBURG, Granite, MT

Built 2004 Load: 29.5 t ADT: 273

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

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Compiled by PlainBridges, Independent data publisher

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.