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:

AMSTERDAM RD

Over: GALLATIN RIVER

3M SW BELGRADE, Gallatin, MT

Built 1951 Load: 15.6 t ADT: 2,207

SPAULDING BR RD

Over: E GALLATIN RIVER 077

4M NE MANHATTAN, Gallatin, MT

Built 1997 Load: 16.3 t ADT: 100

GRAYLING CR RD

Over: GRAYLING CREEK 111

10M N WEST YELLOWSTONE, Gallatin, MT

Built 1977 Load: 16.3 t ADT: 100

I 90

Over: JEFFERSON RIVER OVERFLOW

THREE FORKS, Gallatin, MT

Built 1969 Load: 17.2 t ADT: 8,465

SIXTEEN MILE ROAD

Over: SIXTEEN MILE CREEK 071

2M E MAUDLOW, Gallatin, MT

Built 1954 Load: 17.2 t ADT: 100

PINE BUTTE RD

Over: HIGHLINE CANAL 116

6M S BELGRADE, Gallatin, MT

Built 1987 Load: 17.2 t ADT: 100

LITTLE BEAR RD

Over: BIG BEAR CREEK 118

4M S GALLATIN GATEWAY, Gallatin, MT

Built 1987 Load: 17.2 t ADT: 100

PORCUPINE CR ROAD

Over: GALLATIN RIVER

GALLATIN CANYON, Gallatin, MT

Built 1951 Load: 17.8 t ADT: 99

LANGOHR ROAD

Over: HYALITE CREEK

PAST LANGOHR CAMPGROUND, Gallatin, MT

Built 1952 Load: 18.5 t ADT: 50

MANHATTAN S RD

Over: IRRIGATION CANAL 117

1M S MANHATTAN, Gallatin, MT

Built 1956 Load: 19.0 t ADT: 100

COBB HILL RD

Over: HYALITE CREEK 050

4M W BOZEMAN, Gallatin, MT

Built 1987 Load: 19.1 t ADT: 100

16 MILE CREEK RD

Over: MID FORK 16-MILE CR 072

4M E MAUDLOW, Gallatin, MT

Built 1996 Load: 20.0 t ADT: 100

PINE BUTTE RD

Over: HIGHLINE CANAL 114

6M S BELGRADE, Gallatin, MT

Built 1992 Load: 20.0 t ADT: 100

US 191

Over: GALLATIN RIVER

23M N WEST YELLOWSTONE, Gallatin, MT

Built 1955 Load: 20.0 t ADT: 2,481

US 191 FH 42

Over: SPANISH CREEK

7M S GALLATIN GATEWAY, Gallatin, MT

Built 1931 Load: 20.8 t ADT: 8,666

MAIDEN ROCK RD

Over: BRIDGER CREEK 107

2M E BOZEMAN, Gallatin, MT

Built 1922 Load: 20.9 t ADT: 100

MOFFIT GULCH RD

Over: ROCKY CREEK 044

3M SE BOZEMAN, Gallatin, MT

Built 1976 Load: 20.9 t ADT: 146

US 287

Over: BEAVER CREEK

24M NW WEST YELLOWSTONE, Gallatin, MT

Built 1964 Load: 20.9 t ADT: 945

KELLY CANYON RD

Over: ROCKY CREEK 042

2M E BOZEMAN, Gallatin, MT

Built 2001 Load: 21.8 t ADT: 100

LONE MOUNTAIN TRL

Over: MIDDLE FK W GALLATIN 004

BIG SKY-LONE MOUNTAIN TRL, Gallatin, MT

Built 1979 Load: 21.8 t ADT: 9,549

US 191-HUFFINE LN

Over: HYALITE CREEK

4M W BOZEMAN, Gallatin, MT

Built 1956 Load: 21.8 t ADT: 25,142

FRONTAGE RD-S 205

Over: DRAINAGE

2M NW MANHATTAN, Gallatin, MT

Built 1931 Load: 21.8 t ADT: 1,140

DRY CREEK RD

Over: DRY CREEK

10M N BELGRADE, Gallatin, MT

Built 1929 Load: 21.8 t ADT: 200

STORM CASTLE ROAD

Over: SQ___ CREEK

CASTLE ROCK CMP-STRM CSTL, Gallatin, MT

Built 1954 Load: 22.0 t ADT: 5

LAW RD

Over: S COTTONWOOD CREEK 011

1M E GALLATIN GATEWAY, Gallatin, MT

Built 1975 Load: 22.6 t ADT: 100

OLD YELLOWSTONE TR

Over: WILLOW CREEK

1M S WILLOW CREEK, Gallatin, MT

Built 1949 Load: 22.7 t ADT: 131

W DRY CREEK RD

Over: EAST GALLATIN RIVER

5M E MANHATTAN, Gallatin, MT

Built 1967 Load: 22.7 t ADT: 810

AMSTERDAM RD

Over: BAKER CREEK

4M SW BELGRADE, Gallatin, MT

Built 1952 Load: 22.7 t ADT: 2,207

SPIRE ROCK CG LOOP

Over: STORMCASTLE CREEK

SPIRE ROCK CAMPGROUND, Gallatin, MT

Built 1957 Load: 23.0 t ADT: 50

SPIRE ROCK CG LOOP

Over: STORMCASTLE CREEK

SPIRE ROCK CAMPGROUND, Gallatin, MT

Built 1957 Load: 23.0 t ADT: 50

I 90

Over: MADISON RIVER-RR

0.6M E THREE FORKS, Gallatin, MT

Built 1964 Load: 23.6 t ADT: 9,524

US 191 FH 42

Over: GALLATIN RIVER

4M NE BIG SKY, Gallatin, MT

Built 1952 Load: 23.6 t ADT: 8,666

FRONTAGE RD-S 205

Over: CAMP CREEK

2M SE MANHATTAN, Gallatin, MT

Built 1920 Load: 23.6 t ADT: 2,232

STORY MILL RD

Over: BRIDGER CREEK 088

2M N BOZEMAN, Gallatin, MT

Built 1978 Load: 24.4 t ADT: 100

S 84-NORRIS RD

Over: GALLATIN RIVER

7M W BOZEMAN, Gallatin, MT

Built 1987 Load: 24.5 t ADT: 10,643

FRONTAGE RD-S 205

Over: BAKER CREEK

2M SE MANHATTAN, Gallatin, MT

Built 1921 Load: 24.5 t ADT: 2,232

W DRY CREEK RD

Over: GALLATIN RIVER

2M E MANHATTAN, Gallatin, MT

Built 1967 Load: 24.5 t ADT: 1,263

AMSTERDAM RD

Over: CAMP CREEK 060

AMSTERDAM, Gallatin, MT

Built 1956 Load: 25.4 t ADT: 100

US 191 FH 42

Over: GALLATIN RIVER

5M S GALLATIN GATEWAY, Gallatin, MT

Built 1958 Load: 25.4 t ADT: 10,163

BLACKWOOD RD

Over: HYALITE CREEK 052

4M SW BOZEMAN, Gallatin, MT

Built 1971 Load: 26.3 t ADT: 100

US 191

Over: SPECIMEN CREEK

24M SE BIG SKY, Gallatin, MT

Built 1955 Load: 26.3 t ADT: 2,481

MANLEY RD

Over: E GALLATIN RIVER 089

2M N BOZEMAN, Gallatin, MT

Built 1996 Load: 27.2 t ADT: 100

LOGAN TRIDENT RD

Over: GALLATIN RIVER 008

1M W LOGAN, Gallatin, MT

Built 1964 Load: 27.2 t ADT: 1,303

COTTONWOOD CNYN RD

Over: COTTONWOOD CREEK 041

4M SE GALLATIN GATEWAY, Gallatin, MT

Built 1986 Load: 27.2 t ADT: 100

HEBGEN LAKE ROAD

Over: WATKINS CREEK

NO DATA ENTERED, Gallatin, MT

Built 2011 Load: 28.5 t ADT: 40

S.ROCK CREEK ROAD

Over: ROCK CREEK

S. OF LIVINGSTON, Gallatin, MT

Built 1987 Load: 28.5 t ADT: 50

US 191 FH 42

Over: WEST GALLATIN RIVER

17M SE BIG SKY, Gallatin, MT

Built 1959 Load: 29.0 t ADT: 2,214

S 86-BRIDGER DR

Over: BRIDGER CREEK

2M NE BOZEMAN, Gallatin, MT

Built 2005 Load: 29.0 t ADT: 8,393

US 287

Over: RR

11M SW THREE FORKS, Gallatin, MT

Built 1950 Load: 29.9 t ADT: 1,204

FRONTAGE RD-S 205

Over: RR

LOGAN, Gallatin, MT

Built 2007 Load: 29.9 t ADT: 1,140

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