Gallatin County, MT

207 public highway bridges

Gallatin County Bridge Snapshot

Gallatin County, Montana contains 207 public highway bridges in the FHWA National Bridge Inventory. Roughly 16.4% are rated “Good,” 62.8% “Fair,” 4.3% “Poor,” and 4.3% 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.

207

Total Bridges

16.4%

Good

4.3%

Poor

4.3%

Structurally Deficient

Condition Distribution

Good

16.4% (34)

Fair

62.8% (130)

Poor

4.3% (9)

SD

4.3% (9)

All Bridges (207)

Sort:

I 90

Over: MADISON ROAD

3.1M E THREE FORKS, Gallatin, MT

Built 1963 ADT: 307

I 90

Over: MADISON ROAD

3.1M E THREE FORKS, Gallatin, MT

Built 1963 ADT: 307

I 90

Over: INT LOGAN

LOGAN, Gallatin, MT

Built 1963 ADT: 124

I 90

Over: INT LOGAN

LOGAN, Gallatin, MT

Built 1963 ADT: 124

I 90

Over: MANHATTAN SOUTH RD

0.6M E MANHATTAN, Gallatin, MT

Built 1964 ADT: 100

I 90

Over: MANHATTAN SOUTH RD

0.6M E MANHATTAN, Gallatin, MT

Built 1964 ADT: 100

I 90

Over: SEP HEEB ROAD

2.5M E MANHATTAN, Gallatin, MT

Built 1965 ADT: 102

I 90

Over: SEP HEEB ROAD

2.5M E MANHATTAN, Gallatin, MT

Built 1965 ADT: 102

I 90

Over: SEP THORPE ROAD

5M W BELGRADE, Gallatin, MT

Built 1965 ADT: 923

I 90

Over: SEP THORPE ROAD

5M W BELGRADE, Gallatin, MT

Built 1965 ADT: 923

I 90

Over: INT AIRWAY BLVD

1M E BELGRADE, Gallatin, MT

Built 2014 ADT: 13,002

I 90

Over: INT AIRWAY BLVD

1M E BELGRADE, Gallatin, MT

Built 2014 ADT: 13,002

I 90

Over: SEP VALLEY CENTER SPUR

2.5M W BOZEMAN, Gallatin, MT

Built 1966 ADT: 4,875

I 90

Over: SEP E VALLEY CENTER SPUR

2.5M W BOZEMAN, Gallatin, MT

Built 1966 ADT: 4,875

I 90

Over: SEP N ROUSE AVE-RR

BOZEMAN, Gallatin, MT

Built 2011 ADT: 11,674

I 90

Over: SEP N ROUSE AVE-RR

BOZEMAN, Gallatin, MT

Built 2010 ADT: 9,929

I 90

Over: SEP L STREET

BOZEMAN, Gallatin, MT

Built 1968 ADT: 1,750

I 90

Over: SEP L STREET

BOZEMAN, Gallatin, MT

Built 1968 ADT: 1,750

I 90

Over: INT E BOZEMAN-P 50

BOZEMAN, Gallatin, MT

Built 1971 ADT: 3,821

I 90

Over: INT E BOZEMAN-P 50

BOZEMAN, Gallatin, MT

Built 1971 ADT: 3,821

I 90

Over: SEP FORT ELLIS ROAD

1.2M E BOZEMAN, Gallatin, MT

Built 1971 ADT: 587

I 90

Over: SEP FORT ELLIS ROAD

1.2M E BOZEMAN, Gallatin, MT

Built 1971 ADT: 587

I 90

Over: INT BEAR CANYON

3.7M E BOZEMAN, Gallatin, MT

Built 1962 ADT: 146

I 90

Over: INT BEAR CANYON

3.7M E BOZEMAN, Gallatin, MT

Built 1962 ADT: 146

I 90

Over: INT TRAIL CREEK

7.4M E BOZEMAN, Gallatin, MT

Built 1962 ADT: 700

I 90

Over: INT TRAIL CREEK

7.4M E BOZEMAN, Gallatin, MT

Built 1962 ADT: 700

I 90

Over: INT JACKSON CREEK

9.9M E BOZEMAN, Gallatin, MT

Built 1979 ADT: 100

I 90

Over: INT JACKSON CREEK

9.9M E BOZEMAN, Gallatin, MT

Built 1979 ADT: 100

S 2

Over: E THREE FORKS INT I 90

THREE FORKS, Gallatin, MT

Built 2010 ADT: 9,524

S 85-JACKRABBIT LN

Over: INT BELGRADE I 90

BELGRADE, Gallatin, MT

Built 1998 ADT: 28,680

CHURCHILL RD

Over: INT MANHATTAN-I 90

MANHATTAN, Gallatin, MT

Built 1964 ADT: 19,202

N 19TH AVE

Over: RR-S 205

BOZEMAN-N 19TH AVE, Gallatin, MT

Built 1994 ADT: 6,230

N 19TH AVE

Over: INT N 19TH AVE

BOZEMAN-N 19TH AVE, Gallatin, MT

Built 1994 ADT: 30,201

N SEVENTH AVE

Over: INT N 7TH AVE-I 90

BOZEMAN-N SEVENTH AVE, Gallatin, MT

Built 2014 ADT: 10,307

RIVER RD

Over: LOWLINE CANAL 056

4M N GALLATIN GATEWAY, Gallatin, MT

Built 1933 ADT: 100

OLD TOWN RD

Over: JEFFERSON RIVER 004

2M N THREE FORKS, Gallatin, MT

Built 1897 Load: 4.5 t ADT: 100

N 7TH AVE-FRTG RD

Over: RR - MRL

BOZEMAN-N SEVENTH AVE, Gallatin, MT

Built 1993 Load: 5.4 t ADT: 6,077

DEER CREEK TRLHD.

Over: GALLATIN RIVER

GALLATIN CANYON, Gallatin, MT

Built 1970 Load: 5.8 t ADT: 99

WILLIAMS BR RD

Over: JEFFERSON RIVER 046

5M SW WILLOW CREEK, Gallatin, MT

Built 1898 Load: 6.4 t ADT: 85

DRY CR SCHOOL RD

Over: E GALLATIN RIVER 032

3M E MANHATTAN, Gallatin, MT

Built 1924 Load: 7.3 t ADT: 100

KELLY CANYON RD

Over: BRIDGER CREEK 047

6M NE BOZEMAN, Gallatin, MT

Built 1983 Load: 8.1 t ADT: 100

DURNAM ROAD

Over: GALLATIN RIVER

DURNAM BRIDGE, Gallatin, MT

Built 1970 Load: 10.0 t ADT: 99

STORM CASTLE ROAD

Over: GALLATIN RIVER

STORM CASTLE CREEK, Gallatin, MT

Built 1935 Load: 10.7 t ADT: 99

HAMILTON RD

Over: E GALLATIN RIVER 076

5M E CENTRAL PARK, Gallatin, MT

Built 1928 Load: 10.9 t ADT: 100

MONFORTON SCH RD

Over: HYALITE CREEK 105

4M W BOZEMAN, Gallatin, MT

Built 1992 Load: 11.8 t ADT: 100

HEEB RD

Over: BAKER CREEK 080

5M W BELGRADE, Gallatin, MT

Built 1992 Load: 13.6 t ADT: 102

CAMP CREEK RD

Over: CAMP CREEK 018

S AMSTERDAM, Gallatin, MT

Built 1986 Load: 13.6 t ADT: 100

S 205-FRONTAGE RD

Over: MADISON RIVER

1M E THREE FORKS, Gallatin, MT

Built 1948 Load: 14.3 t ADT: 1,473

BIGGS HAUGLAND RD

Over: DRY CREEK 079

2M S MENARD, Gallatin, MT

Built 1985 Load: 15.4 t ADT: 100

STAGECOACH TRL RD

Over: BAKER CREEK OVERFLOW 081

5M NW BELGRADE, Gallatin, MT

Built 1965 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 U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 5, 2026