Fergus County, MT

155 public highway bridges

Fergus County Bridge Snapshot

Fergus County, Montana contains 155 public highway bridges in the FHWA National Bridge Inventory. Roughly 30.3% are rated “Good,” 63.2% “Fair,” 6.5% “Poor,” and 6.5% 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.

155

Total Bridges

30.3%

Good

6.5%

Poor

6.5%

Structurally Deficient

Condition Distribution

Good

30.3% (47)

Fair

63.2% (98)

Poor

6.5% (10)

SD

6.5% (10)

All Bridges (155)

Sort:

US 87

Over: DRAINAGE

12M E LEWISTOWN, Fergus, MT

Built 1930 Load: 24.5 t ADT: 1,442

S 80

Over: ARROW CREEK

17M S GERALDINE, Fergus, MT

Built 1949 Load: 24.5 t ADT: 170

HANOVER RD

Over: JUDITH RIVER

5M NE KOLIN, Fergus, MT

Built 1970 Load: 24.5 t ADT: 113

FISH HATCHERY RD

Over: E FORK BIG SPRING CREEK

4M SE LEWISTOWN, Fergus, MT

Built 1966 Load: 24.5 t ADT: 161

WINIFRED HWY

Over: DOG CREEK

4M N HILGER, Fergus, MT

Built 1953 Load: 25.4 t ADT: 474

WINIFRED HWY

Over: DRAINAGE

3M S CHRISTINA, Fergus, MT

Built 1954 Load: 25.4 t ADT: 474

WINIFRED HWY

Over: DOG CREEK

CHRISTINA, Fergus, MT

Built 1954 Load: 25.4 t ADT: 474

US 191-1ST AVE N

Over: BIG SPRING CREEK

LEWISTOWN-1ST AVE N, Fergus, MT

Built 1960 Load: 26.3 t ADT: 6,387

US 87

Over: DRAINAGE

10M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 26.3 t ADT: 1,442

HANOVER RD

Over: BIG SPRING CREEK

8M NW LEWISTOWN, Fergus, MT

Built 1966 Load: 26.3 t ADT: 1

DONALDSON RD

Over: DRY WOLF CREEK 090

7M E DENTON, Fergus, MT

Built 1982 Load: 27.2 t ADT: 100

UPPER ELK CR RD

Over: ELK CREEK 126

6M S GRASSRANGE, Fergus, MT

Built 1982 Load: 27.2 t ADT: 100

US 87

Over: DRAINAGE

6M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 27.2 t ADT: 1,300

US 87

Over: DRAINAGE

3M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 27.2 t ADT: 1,300

S 81

Over: DRY WOLF CREEK

6M SE DENTON, Fergus, MT

Built 1949 Load: 27.2 t ADT: 263

COUNTY ROAD 220

Over: FORDS CREEK 006

14M NW GRASSRANGE, Fergus, MT

Built 1981 Load: 28.1 t ADT: 100

US 191

Over: ARMELLS CREEK

27M NE ROY, Fergus, MT

Built 1963 Load: 28.1 t ADT: 622

SALT CREEK RD

Over: SALT CREEK 053

7M NW SUFFOLK, Fergus, MT

Built 1984 Load: 29.0 t ADT: 100

US 191

Over: BOX ELDER CREEK

2M E ROY, Fergus, MT

Built 1942 Load: 29.0 t ADT: 287

US 87

Over: DRAINAGE

7M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 29.0 t ADT: 1,300

US 87

Over: DRAINAGE

4M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 29.0 t ADT: 1,300

US 87

Over: DRAINAGE

2M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 29.0 t ADT: 1,300

HITCHCOCK RD

Over: DRY WOLF CREEK 095

5M SE DENTON, Fergus, MT

Built 1980 Load: 29.3 t ADT: 4

BUTCHER RD

Over: DOG CREEK 107

4M S WINIFRED, Fergus, MT

Built 1962 Load: 29.9 t ADT: 100

US 87-W MAIN ST

Over: BIG SPRING CREEK

LEWISTOWN-W MAIN ST, Fergus, MT

Built 1962 Load: 29.9 t ADT: 5,247

US 87

Over: ELK CREEK

5M SE GRASS RANGE, Fergus, MT

Built 1952 Load: 29.9 t ADT: 1,038

LOWER RD

Over: WOLF CREEK 086

5M SW DENTON, Fergus, MT

Built 1962 Load: 30.8 t ADT: 73

US 87

Over: COTTONWOOD CREEK

5M SW LEWISTOWN, Fergus, MT

Built 2009 Load: 30.8 t ADT: 2,443

S 81

Over: WARM SPRING CREEK

7M SW HILGER, Fergus, MT

Built 1949 Load: 30.8 t ADT: 375

S 81

Over: WARM SPRING CREEK

5M SW HILGER, Fergus, MT

Built 1969 Load: 30.8 t ADT: 375

S COFFEE CR RD

Over: WOLF CREEK 076

4M S COFFEE CREEK, Fergus, MT

Built 1979 Load: 31.1 t ADT: 34

US 87

Over: BOYD CREEK

1M E LEWISTOWN, Fergus, MT

Built 1942 Load: 31.8 t ADT: 2,908

DY TRAIL

Over: DOG CREEK 110

E WINIFRED, Fergus, MT

Built 1962 Load: 32.7 t ADT: 167

TOGNETTI RD

Over: ROSS FORK 038

5M NW MOORE, Fergus, MT

Built 1995 Load: 32.7 t ADT: 100

CRABTREE RD

Over: DRY WOLF CREEK 092

5M SE DENTON, Fergus, MT

Built 1962 Load: 32.7 t ADT: 100

PINE STREET

Over: BIG SPRING CREEK 058

LEWISTOWN-PINE ST, Fergus, MT

Built 1962 Load: 32.7 t ADT: 100

S 238-E FORK RD

Over: E FORK BIG SPRING CREEK

8M SE LEWISTOWN, Fergus, MT

Built 1958 Load: 32.7 t ADT: 216

SW ASH ST

Over: BIG SPRING CREEK

LEWISTOWN-SW ASH ST, Fergus, MT

Built 1962 Load: 32.7 t ADT: 1,386

3 MILE RD

Over: SALT CREEK 055

6M W SUFFOLK, Fergus, MT

Built 1962 Load: 33.5 t ADT: 100

US 191

Over: WARM SPRINGS CREEK

5M SW HILGER, Fergus, MT

Built 2011 Load: 34.5 t ADT: 841

WINIFRED HWY

Over: DOG CREEK

CHRISTINA, Fergus, MT

Built 1954 Load: 34.5 t ADT: 382

SERIGHT RD

Over: ROCK CREEK 045

3M E MOORE, Fergus, MT

Built 1962 Load: 35.3 t ADT: 100

CIMRHAKL RD

Over: SACAGAWEA RIV 114

8M NE ROY, Fergus, MT

Built 1978 Load: 35.4 t ADT: 100

YELLOW WATER RD

Over: ELK CREEK 136

7 M SE GRASSRANGE, Fergus, MT

Built 1974 Load: 36.5 t ADT: 100

SALT CREEK RD

Over: DOG CREEK 054

N SUFFOLK, Fergus, MT

Built 1962 Load: 37.1 t ADT: 100

LOWER RD

Over: COYOTE CREEK 085

1M SW DENTON, Fergus, MT

Built 1977 Load: 59.1 t ADT: 73

UPPER CHIPPEWA RD

Over: CHIPPEWA CREEK 021

8M NW GRASSRANGE, Fergus, MT

Built 1962 Load: 99.9 t ADT: 100

US 191

Over: ROSS FORK CREEK

2M N JUDITH GAP, Fergus, MT

Built 1990 Load: 99.9 t ADT: 2,077

FOREST GROVE RD

Over: S FORK MCDONALD CREEK

5M SW GRASSRANGE, Fergus, MT

Built 2021 Load: 12.7 t ADT: 146

ALLEN ROAD

Over: COFFEE CREEK

9M NE DENTON, Fergus, MT

Built 2021 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 6, 2026