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)

MT 38-SKALKAHO RD

Good

Over: ROCK CREEK 013

10M W PORTERS CORNER, Granite, MT

Built 1989 Load: 29.9 t ADT: 273

MT 38-SKALKAHO RD

Good

Over: W FORK ROCK CREEK 006

10M E SKALKAHO PASS, Granite, MT

Built 1991 Load: 30.1 t ADT: 219

S 512

Good

Over: FLINT CREEK

1M E HALL, Granite, MT

Built 1964 Load: 31.8 t ADT: 218

MT 38-SKALKAHO RD

Good

Over: W FORK ROCK CREEK 012

12M E SKALKAHO PASS, Granite, MT

Built 1974 Load: 32.7 t ADT: 219

UPPER ROCK CR RD

Good

Over: ROCK CREEK 010

20M W PHILLIPSBURG, Granite, MT

Built 1976 Load: 32.7 t ADT: 592

NO DATA ENTERED

Good

Over: MEADOW CR

BEGINNING OF MCDOUGAL RD, Granite, MT

Built 1978 Load: 35.3 t ADT: 40

ROCK CREEK ROAD

Good

Over: COUGAR CREEK

T08N R17W S07, Granite, MT

Built 2008 Load: 36.3 t ADT: 40

HENDERSON CREEK RO

Good

Over: FLINT CREEK 035

11M S DRUMMOND, Granite, MT

Built 2013 Load: 37.2 t ADT: 100

DOUGLAS CREEK ROAD

Good

Over: FLINT CREEK 004

8M S DRUMMOND, Granite, MT

Built 2015 Load: 38.1 t ADT: 100

ROAD 358

Good

Over: HARVEY CREEK

HARVEY CREEK, Granite, MT

Built 1984 Load: 38.2 t ADT: 40

CABLE MTN CAMPGROU

Good

Over: N FK FLINT CREEK

NO DATA ENTERED, Granite, MT

Built 2015 Load: 41.8 t ADT: 40

I 90

Good

Over: HARVEY CREEK

3M E BEARMOUTH INT, Granite, MT

Built 1970 Load: 53.5 t ADT: 11,980

I 90

Good

Over: RATTLER GULCH

4.1M W DRUMMOND, Granite, MT

Built 1971 Load: 57.2 t ADT: 11,980

MOOSE LAKE RD

Good

Over: E FORK ROCK CREEK 030

10M SW PORTERS CORNER, Granite, MT

Built 1950 Load: 74.4 t ADT: 183

I 90

Good

Over: DRAINAGE

4.8M E BEARMOUTH INT, Granite, MT

Built 1971 Load: 99.9 t ADT: 11,980

NO DATA ENTERED

Poor

Over: BOULDER CR

BOULDER CREEK, Granite, MT

Built 1949 Load: 19.1 t ADT: 50

NO DATA ENTERED

Poor

Over: SWAMP GUL

SWAMP GULCH, Granite, MT

Built 1987 Load: 27.2 t ADT: 50

MARSHALL CREEK RD

Poor

Over: ROCK CREEK

14M W PHILIPSBURG, Granite, MT

Built 1959 Load: 27.2 t ADT: 158

BEAR GULCH RD

Poor

Over: CLARK FORK RIVER 002

1M NE BEARMOUTH, Granite, MT

Built 1986 Load: 29.9 t ADT: 128

I 90

Poor

Over: CLARK FORK RIVER

5M W DRUMMOND, Granite, MT

Built 1970 Load: 31.8 t ADT: 11,980

S MAIN STREET

Poor

Over: CLARK FORK RIVER 020

S DRUMMOND, Granite, MT

Built 1934 Load: 34.5 t ADT: 565

S 1

Poor

Over: CLARK FORK

DRUMMOND, Granite, MT

Built 1966 Load: 37.2 t ADT: 1,329

I 90

Poor

Over: ANTELOPE CREEK

11.2M W DRUMMOND, Granite, MT

Built 1971 Load: 39.0 t ADT: 100

Read our methodology - how this data is sourced, computed, and verified.

Related

Browse all → | Rankings →
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.