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:

PIONEER ROAD

Over: COYOTE CREEK

4 MILES SOUTHWEST OF DENT, Fergus, MT

Built 1979 Load: 7.3 t ADT: 100

ARMELLS ROAD

Over: ARMELLS CREEK

11M NE HILGER, Fergus, MT

Built 2022 Load: 8.2 t ADT: 100

2ND AVENUE

Over: BIG SPRING CREEK 060

LEWISTOWN-2ND AVE, Fergus, MT

Built 1930 Load: 9.9 t ADT: 100

POOR FARM LOOP

Over: BIG SPRING CREEK

1M NW Lewistown, Fergus, MT

Built 1908 Load: 10.0 t ADT: 100

72 BENCH RD

Over: WARM SPRINGS CREEK 078

5M N DANVERS, Fergus, MT

Built 1980 Load: 10.0 t ADT: 100

FOREST GROVE RD

Over: S FORK MCDONALD CR 070

4M SW GRASSRANGE, Fergus, MT

Built 1982 Load: 10.0 t ADT: 146

SINGLE PINE RD

Over: COTTONWOOD CREEK 028

7M SW LEWISTOWN, Fergus, MT

Built 1989 Load: 10.0 t ADT: 100

BALLY DOME RD

Over: WOLF CREEK 089

7M E DENTON, Fergus, MT

Built 1979 Load: 11.8 t ADT: 100

VALENTINE RD

Over: BOX ELDER CREEK 130

8M E ROY, Fergus, MT

Built 1983 Load: 11.8 t ADT: 100

FOREST GROVE RD

Over: S FORK MCDONALD CR 046

6M SW GRASSRANGE, Fergus, MT

Built 1986 Load: 11.8 t ADT: 146

ALTON CUTOFF

Over: WOLF CREEK 091

4M E DENTON, Fergus, MT

Built 1979 Load: 12.7 t ADT: 100

ARNTZEN LN

Over: DOG CREEK

2M SE CHRISTINA, Fergus, MT

Built 2020 Load: 14.5 t ADT: 100

PACER COULEE RD

Over: DRY WOLF CREEK 093

4M SE DENTON, Fergus, MT

Built 1990 Load: 14.5 t ADT: 100

TYLER CUTOFF

Over: MCDONALD CREEK 125

1M S GRASSRANGE, Fergus, MT

Built 1975 Load: 15.4 t ADT: 100

US 87-E MAIN ST

Over: MILL DITCH

LEWISTOWN-E MAIN ST, Fergus, MT

Built 1922 Load: 15.4 t ADT: 8,688

W BRASSEY ST

Over: BIG SPRING CREEK

LEWISTOWN-W BRASSEY ST, Fergus, MT

Built 1920 Load: 15.4 t ADT: 1,899

NFSR #275

Over: ROCK CREEK

3 MI. N. OF CRYSTAL LAKE, Fergus, MT

Built 1938 Load: 15.9 t ADT: 50

N DENTON RD

Over: COFFEE CREEK 081

6M N DENTON, Fergus, MT

Built 1979 Load: 16.3 t ADT: 100

NFSR #275

Over: ROCK CREEK

5 MI NORTH OF CRYSTAL LK, Fergus, MT

Built 1954 Load: 16.5 t ADT: 50

OLIES RD

Over: WOLF CREEK 088

6M E DENTON, Fergus, MT

Built 1983 Load: 16.8 t ADT: 100

ERLE LN

Over: DOG CREEK 102

SUFFOLK, Fergus, MT

Built 1981 Load: 17.2 t ADT: 100

HITCHCOCK RD

Over: DRY WOLF CREEK 096

6M SE DENTON, Fergus, MT

Built 1980 Load: 17.7 t ADT: 4

BEAR SPRINGS RD

Over: WOLF CREEK 013

11M NE DENTON, Fergus, MT

Built 1980 Load: 18.1 t ADT: 13

CUNNINGHAM RD

Over: DRY WOLF CREEK 094

6M S DENTON, Fergus, MT

Built 1982 Load: 18.1 t ADT: 100

MILLER STREET

Over: MILL DITCH 041

LEWISTOWN-MILLER ST, Fergus, MT

Built 1973 Load: 18.1 t ADT: 100

WILDER TRAIL

Over: SACAGAWEA RIV 113

11M NE ROY, Fergus, MT

Built 2015 Load: 19.1 t ADT: 100

VALENTINE RD

Over: BLOOD CREEK 131

4M NW VALENTINE, Fergus, MT

Built 1980 Load: 19.1 t ADT: 100

FOREST GROVE RD

Over: S FORK MCDONALD CR 071

4M SW GRASSRANGE, Fergus, MT

Built 1970 Load: 19.1 t ADT: 146

US 87

Over: IRRIGATION RESERVOIR

6M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 19.1 t ADT: 1,300

S 81

Over: COFFEE CREEK

COFFEE CREEK, Fergus, MT

Built 1952 Load: 19.1 t ADT: 345

WATER STREET

Over: BIG SPRING CREEK 059

LEWISTOWN-WATER ST, Fergus, MT

Built 1930 Load: 20.8 t ADT: 100

COUNTY ROAD 116

Over: ARMELLS CREEK 115

10M NE HILGER, Fergus, MT

Built 1977 Load: 20.9 t ADT: 100

GRINDE RD

Over: WARM SPRINGS CREEK 009

4M SW HILGER, Fergus, MT

Built 1986 Load: 20.9 t ADT: 100

U BET RD

Over: ROSS FORK CREEK 026

W GARNEILL, Fergus, MT

Built 1987 Load: 20.9 t ADT: 36

UPPER SPRING CR RD

Over: MILL DITCH

LEWISTOWN, Fergus, MT

Built 1958 Load: 20.9 t ADT: 6,241

E BOULEVARD ST

Over: BIG SPRING CREEK

LEWISTOWN-E BOULEVARD ST, Fergus, MT

Built 1920 Load: 20.9 t ADT: 671

WASHBOARD RD

Over: DOG CREEK 101

W SUFFOLK, Fergus, MT

Built 1983 Load: 21.8 t ADT: 100

UPPER CHIPPEWA RD

Over: CHIPPEWA CREEK 004

5M NW GRASSRANGE, Fergus, MT

Built 1980 Load: 21.8 t ADT: 100

JENNI RD

Over: BEAVER CREEK 030

7M W LEWISTOWN, Fergus, MT

Built 1929 Load: 21.8 t ADT: 100

US 87

Over: S FORK MCDONALD CREEK

1M N GRASS RANGE, Fergus, MT

Built 1939 Load: 21.8 t ADT: 1,300

ROSE CREEK RD

Over: ROSE CREEK 108

3M E WINIFRED, Fergus, MT

Built 1980 Load: 22.7 t ADT: 100

S FORK RD

Over: FLATWILLOW CREEK 124

14M SE FORESTGROVE, Fergus, MT

Built 1986 Load: 22.7 t ADT: 100

GRAVES RD

Over: FLATWILLOW CREEK 001

20M S GRASSRANGE, Fergus, MT

Built 1988 Load: 22.7 t ADT: 100

US 87

Over: N FORK MCDONALD CREEK

8M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 22.7 t ADT: 1,300

US 87

Over: DRAINAGE

2M NW GRASS RANGE, Fergus, MT

Built 1939 Load: 22.7 t ADT: 1,300

VALENTINE RD

Over: BLOOD CREEK 132

25M N WINNETT, Fergus, MT

Built 1986 Load: 23.6 t ADT: 100

LWR COTTONWOOD CR

Over: COTTONWOOD CREEK 034

8M W LEWISTOWN, Fergus, MT

Built 2009 Load: 23.6 t ADT: 26

US 191-KENDALL RD

Over: BIG SPRING CREEK

LEWISTOWN-KENDALL RD, Fergus, MT

Built 1976 Load: 23.6 t ADT: 3,046

US 87

Over: BOYD CREEK

3M E LEWISTOWN, Fergus, MT

Built 1942 Load: 23.6 t ADT: 1,477

SURENUFF RD

Over: S FORK MCDONALD CR 002

FOREST GROVE, Fergus, MT

Built 1982 Load: 24.5 t ADT: 100

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

Related

Browse all → | Rankings →

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