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:

S 19TH RD

Over: HYALITE CREEK

6M SW BOZEMAN, Gallatin, MT

Built 1988 Load: 29.9 t ADT: 1,821

LITTLE BEAR RD

Over: W GALLATIN CANAL 119

2M S GALLATIN GATEWAY, Gallatin, MT

Built 2005 Load: 30.7 t ADT: 100

I 90

Over: MADISON RIVER-RR

0.6M E THREE FORKS, Gallatin, MT

Built 1964 Load: 30.8 t ADT: 9,524

PENWELL BRIDGE RD

Over: E GALLATIN RIVER 059

3M NE BELGRADE, Gallatin, MT

Built 1985 Load: 30.8 t ADT: 560

SPAIN BRIDGE RD

Over: E GALLATIN RIVER 058

5M E BELGRADE, Gallatin, MT

Built 1975 Load: 30.8 t ADT: 100

CANAL RD

Over: GODFREY CREEK 083

2M S CHURCHILL, Gallatin, MT

Built 1988 Load: 30.8 t ADT: 100

SPRINGHILL RD

Over: EAST GALLATIN RIVER

3M NW BOZEMAN, Gallatin, MT

Built 1990 Load: 30.8 t ADT: 9,053

SPRINGHILL RD

Over: CHURN CREEK

4M NW BOZEMAN, Gallatin, MT

Built 1990 Load: 30.8 t ADT: 9,053

E KAGY BLVD

Over: BOZEMAN CREEK

BOZEMAN-E KAGY BLVD, Gallatin, MT

Built 1984 Load: 30.8 t ADT: 9,638

US 287

Over: GRAYLING CREEK

10M NW WEST YELLOWSTONE, Gallatin, MT

Built 1964 Load: 31.8 t ADT: 1,059

DRY CREEK RD

Over: E GALLATIN RIVER OVERFLO

4M N BELGRADE, Gallatin, MT

Built 1957 Load: 31.8 t ADT: 2,093

I 90

Over: DARLINGTON DITCH

1.9M E THREE FORKS, Gallatin, MT

Built 1963 Load: 32.7 t ADT: 9,524

I 90

Over: DARLINGTON DITCH

1.9M E THREE FORKS, Gallatin, MT

Built 1963 Load: 32.7 t ADT: 9,524

I 90

Over: RR

BOZEMAN, Gallatin, MT

Built 1971 Load: 32.7 t ADT: 10,307

SIXTEEN MILE ROAD

Over: SIXTEEN MILE CREEK 070

MAUDLOW, Gallatin, MT

Built 1974 Load: 32.7 t ADT: 100

W CAMERON BR RD

Over: GALLATIN RIVER 048

1M SW BELGRADE, Gallatin, MT

Built 2007 Load: 32.7 t ADT: 100

COTTONWOOD RD

Over: S COTTONWOOD CREEK 123

3.5M SE GALLATIN GATEWAY, Gallatin, MT

Built 2014 Load: 32.7 t ADT: 100

COTTONWOOD ROAD

Over: S COTTONWOOD CREEK 124

3.6M SE GALLATIN GATEWAY, Gallatin, MT

Built 2014 Load: 32.7 t ADT: 100

CHAPMAN RD

Over: HYALITE CREEK 049

5M SW BOZEMAN, Gallatin, MT

Built 2014 Load: 32.7 t ADT: 100

JOHNSON ROAD

Over: HYALITE CREEK 125

6M SW BOZEMAN, Gallatin, MT

Built 2014 Load: 32.7 t ADT: 100

E GRIFFIN DR

Over: E GALLATIN RIVER 090

1M N BOZEMAN, Gallatin, MT

Built 1989 Load: 32.7 t ADT: 7,331

E TAMARACK STREET

Over: BOZEMAN CREEK 115

BOZEMAN-E TAMARACK ST, Gallatin, MT

Built 1982 Load: 32.7 t ADT: 100

US 287

Over: MADISON RIVER

3M N WEST YELLOWSTONE, Gallatin, MT

Built 1968 Load: 32.7 t ADT: 3,903

US 191 FH 42

Over: GRAYLING CREEK

14M N WEST YELLOWSTONE, Gallatin, MT

Built 1962 Load: 32.7 t ADT: 2,481

US 191 FH 42

Over: GRAYLING CREEK

15M N WEST YELLOWSTONE, Gallatin, MT

Built 1962 Load: 32.7 t ADT: 2,481

US 191 FH 42

Over: GALLATIN RIVER

14M S GALLATIN GATEWAY, Gallatin, MT

Built 1950 Load: 32.7 t ADT: 8,666

TRIDENT RD

Over: GALLATIN RIVER

1M SW TRIDENT, Gallatin, MT

Built 1975 Load: 32.7 t ADT: 487

DRY CREEK RD

Over: EAST GALLATIN RIVER

3M N BELGRADE, Gallatin, MT

Built 1957 Load: 32.7 t ADT: 2,093

GATEWAY S RD

Over: GALLATIN RIVER 019

GALLATIN GATEWAY, Gallatin, MT

Built 2001 Load: 33.2 t ADT: 100

I 90

Over: RR

BOZEMAN, Gallatin, MT

Built 1971 Load: 33.6 t ADT: 10,307

US 191 FH 42

Over: GRAYLING CREEK

10M N WEST YELLOWSTONE, Gallatin, MT

Built 2012 Load: 33.6 t ADT: 2,481

S 86-BRIDGER DR

Over: EAST GALLATIN RIVER

1M N BOZEMAN, Gallatin, MT

Built 1984 Load: 33.7 t ADT: 8,393

US 287

Over: CABIN CREEK

23M NW WEST YELLOWSTONE, Gallatin, MT

Built 1964 Load: 34.0 t ADT: 945

L ST

Over: E GALLATIN RIVER 091

NE BOZEMAN, Gallatin, MT

Built 2001 Load: 34.4 t ADT: 1,750

I 90

Over: MADISON RIVER OVERFLOW

2.5M E THREE FORKS, Gallatin, MT

Built 1963 Load: 34.5 t ADT: 9,524

US 191 FH 45

Over: COUGAR CREEK

7M N WEST YELLOWSTONE, Gallatin, MT

Built 1964 Load: 34.5 t ADT: 3,257

US 191 FH 42

Over: SWAN CREEK

12M NE BIG SKY, Gallatin, MT

Built 2009 Load: 34.5 t ADT: 8,666

E VALLEY CENTER RD

Over: HYALITE CREEK

3M NW BOZEMAN, Gallatin, MT

Built 2011 Load: 34.5 t ADT: 6,077

DRY CREEK RD

Over: REESE CREEK

4M N BELGRADE, Gallatin, MT

Built 1957 Load: 34.5 t ADT: 2,093

I 90

Over: RR

4.3M E BOZEMAN, Gallatin, MT

Built 2006 Load: 35.4 t ADT: 9,533

I 90

Over: RR

4.3M E BOZEMAN, Gallatin, MT

Built 2006 Load: 35.4 t ADT: 9,533

BRACKETT CR RD

Over: BRACKETT CREEK 121

19M N BOZEMAN, Gallatin, MT

Built 1989 Load: 35.7 t ADT: 257

I 90

Over: JEFFERSON RIVER OVERFLOW

THREE FORKS, Gallatin, MT

Built 1969 Load: 36.3 t ADT: 8,465

I 90

Over: ABANDONED RR

THREE FORKS, Gallatin, MT

Built 1969 Load: 37.2 t ADT: 8,465

LONE MOUNTAIN TRL

Over: W FORK W GALLATIN 001

2M E BIG SKY, Gallatin, MT

Built 1972 Load: 37.2 t ADT: 9,549

US 20

Over: S FORK MADISON RIVER

4M W WEST YELLOWSTONE, Gallatin, MT

Built 2009 Load: 37.2 t ADT: 4,289

GATEWAY S RD

Over: GALLATIN RIVER 020

1M W GALLATIN GATEWAY, Gallatin, MT

Built 2001 Load: 37.7 t ADT: 100

US 191 FH 42

Over: WEST FORK GALLATIN RIVER

2M E BIG SKY, Gallatin, MT

Built 2009 Load: 38.1 t ADT: 8,666

SKUNK CREEK ROAD

Over: BRACKETT CREEK

BANGTAILS - N.OF BOZEMAN, Gallatin, MT

Built 1972 Load: 38.6 t ADT: 50

S 2

Over: JEFFERSON RIVER

2M W THREE FORKS, Gallatin, MT

Built 1949 Load: 39.0 t ADT: 1,487

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