Granite County, MT

73 public highway bridges

Granite County Bridge Snapshot

Granite County, Montana contains 73 public highway bridges in the FHWA National Bridge Inventory. Roughly 31.5% are rated “Good,” 42.5% “Fair,” 11% “Poor,” and 11% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in MT are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

73
Total Bridges
31.5%
Good
11%
Poor
11%
Structurally Deficient

Condition Distribution

Good
31.5% (23)
Fair
42.5% (31)
Poor
11% (8)
SD
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

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

NO DATA ENTERED

Structurally Deficient

Over: SWAMP GUL

SWAMP GULCH, Granite, MT

Built 1987 Load: 27.2 t ADT: 50

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

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial