Cascade County, MT

185 public highway bridges

Cascade County Bridge Snapshot

Cascade County, Montana contains 185 public highway bridges in the FHWA National Bridge Inventory. Roughly 28.6% are rated “Good,” 42.2% “Fair,” 3.8% “Poor,” and 3.8% 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.

185

Total Bridges

28.6%

Good

3.8%

Poor

3.8%

Structurally Deficient

Condition Distribution

Good

28.6% (53)

Fair

42.2% (78)

Poor

3.8% (7)

SD

3.8% (7)

All Bridges (185)

Sort:

BROWN RD

Over: SAND COULEE CREEK 088

TRACY, Cascade, MT

Built 1950 Load: 12.7 t ADT: 100

FDR 839

Over: LOGGING CREEK

14 MI. WEST OF JCT US89, Cascade, MT

Built 1956 Load: 13.9 t ADT: 46

FDR 1122

Over: BELT CREEK

0.1 MI W OF BELT CR. R.S., Cascade, MT

Built 1972 Load: 14.3 t ADT: 50

FDR 839

Over: LOGGING CREEK

13.5 MI. W. US89/839 JCT, Cascade, MT

Built 1956 Load: 14.3 t ADT: 46

7TH LN

Over: GREENFIELD S CANAL 065

7M E FAIRFIELD, Cascade, MT

Built 1950 Load: 14.5 t ADT: 100

SHAW CUTOFF RD

Over: LITTLE MUDDY CREEK 126

12M NW CASCADE, Cascade, MT

Built 1933 Load: 15.4 t ADT: 100

1ST RD S

Over: MILL COULEE CANAL 046

9M E FAIRFIELD, Cascade, MT

Built 2004 Load: 16.1 t ADT: 100

COUNTY LINE RD

Over: GREENFIELD CANAL 044

7M E FAIRFIELD, Cascade, MT

Built 1973 Load: 16.2 t ADT: 100

WILLOW CREEK RD

Over: LITTLE BELT CREEK 003

14M E BELT, Cascade, MT

Built 1938 Load: 16.3 t ADT: 157

OLD US HWY 91

Over: MUDDY CREEK SLOUGH 111

ULM, Cascade, MT

Built 1923 Load: 16.3 t ADT: 100

FDR 3411

Over: BELT CREEK

MANY PINES CAMPGROUND, Cascade, MT

Built 1962 Load: 16.5 t ADT: 50

E HIGHWOOD RD

Over: BELT CREEK 002

8M N BELT, Cascade, MT

Built 1935 Load: 17.2 t ADT: 100

CENTRAL AVE

Over: BELT CREEK 084

ARMINGTON, Cascade, MT

Built 1938 Load: 17.2 t ADT: 284

15TH ST N-US 87

Over: MISSOURI R-RIVERS TRAIL

GREAT FALLS-15TH ST N, Cascade, MT

Built 1962 Load: 17.2 t ADT: 13,743

NFSR 613

Over: DRY FORK BELT CREEK

RUBY HENN, Cascade, MT

Built 1956 Load: 18.8 t ADT: 50

NFSR 834

Over: HARLEY CREEK

1.2 MILES WEST US89, Cascade, MT

Built 1953 Load: 19.1 t ADT: 50

NFSR 834

Over: HARLEY CREEK

0.2 MILES WEST US89, Cascade, MT

Built 1953 Load: 19.8 t ADT: 50

MILLEGAN RD

Over: SMITH RIVER

5M SE ULM, Cascade, MT

Built 1950 Load: 20.0 t ADT: 292

NFSR 834

Over: GRAVEYARD GULCH CREEK

1.4 MILES WEST US89, Cascade, MT

Built 1953 Load: 20.4 t ADT: 50

PARKER RD

Over: SUN RIVER SLOUGH 060

4M W SUN RIVER, Cascade, MT

Built 1950 Load: 20.9 t ADT: 100

11TH LN

Over: GREENFIELD S CANAL 047

11M E FAIRFIELD, Cascade, MT

Built 2009 Load: 21.5 t ADT: 100

GORDON RD

Over: MUDDY CREEK 042

7M NW VAUGHN, Cascade, MT

Built 1973 Load: 21.7 t ADT: 70

OLD US 91

Over: MISSOURI RIVER-RR 069

11M S CASCADE, Cascade, MT

Built 1931 Load: 21.8 t ADT: 314

I 15

Over: MISSOURI RIVER

7M N CRAIG, Cascade, MT

Built 1971 Load: 22.7 t ADT: 2,224

I 15

Over: MISSOURI RIVER

7M N CRAIG, Cascade, MT

Built 1971 Load: 22.7 t ADT: 2,224

CENTRAL AVE E

Over: MISSOURI RIVER

CASCADE, Cascade, MT

Built 1954 Load: 22.7 t ADT: 287

RIVER RD

Over: BIRD CREEK 036

5M NE CASCADE, Cascade, MT

Built 1940 Load: 23.6 t ADT: 100

OLD ULM CASCADE RD

Over: LITTLE MUDDY CREEK 067

7M NE CASCADE, Cascade, MT

Built 1987 Load: 23.6 t ADT: 100

OLD US 91

Over: PREWETT CREEK 070

10M S CASCADE, Cascade, MT

Built 1931 Load: 23.6 t ADT: 314

OLD US 91

Over: NOVAK CREEK 005

12M S CASCADE, Cascade, MT

Built 1931 Load: 24.5 t ADT: 314

MILLEGAN RD

Over: MISSOURI RIVER

ULM, Cascade, MT

Built 1983 Load: 25.0 t ADT: 549

US 89

Over: MILL COULEE CANAL

5M N FORT SHAW, Cascade, MT

Built 1940 Load: 25.4 t ADT: 1,747

MILL COULEE RD

Over: MILL COULEE CANAL 064

8M SE FAIRFIELD, Cascade, MT

Built 1920 Load: 26.3 t ADT: 100

COUNTY ROAD 242

Over: OTTER CREEK 125

BLYTHE, Cascade, MT

Built 1950 Load: 26.3 t ADT: 9

US 89

Over: MILL COULEE CREEK

1M NE SUN RIVER, Cascade, MT

Built 1940 Load: 26.3 t ADT: 1,428

6TH ST SW

Over: SUN RIVER

GREAT FALLS-6TH ST SW, Cascade, MT

Built 1980 Load: 26.3 t ADT: 14,706

10TH LN

Over: BENCH SOUTH CANAL 048

10M E FAIRFIELD, Cascade, MT

Built 1984 Load: 27.2 t ADT: 100

EWING RD

Over: BELT CREEK 074

3M N BELT, Cascade, MT

Built 1973 Load: 27.2 t ADT: 100

COUNTY LINE RD

Over: GREENFIELD S CANAL 043

9M E FAIRFIELD, Cascade, MT

Built 1982 Load: 28.1 t ADT: 100

BELT PARK RD

Over: BELT CREEK 019

3M S MONARCH, Cascade, MT

Built 1955 Load: 28.1 t ADT: 100

US 89

Over: MILL COULEE CREEK

2M NE SUN RIVER, Cascade, MT

Built 1940 Load: 28.1 t ADT: 1,428

LOWER RIVER RD

Over: SAND COULEE CREEK

3M S GREAT FALLS, Cascade, MT

Built 1937 Load: 28.1 t ADT: 1,587

ARMINGTON RD

Over: BIG OTTER CREEK 029

3M SE BELT, Cascade, MT

Built 1954 Load: 28.5 t ADT: 100

ASHUELOT HILL RD

Over: BENCH SOUTH CANAL 066

9M E FAIRFIELD, Cascade, MT

Built 1950 Load: 29.0 t ADT: 26

MT 21

Over: FORT SHAW CANAL 110

3M W SIMMS, Cascade, MT

Built 1934 Load: 29.0 t ADT: 418

MT 21

Over: SIMMS CREEK 112

2M W SIMMS, Cascade, MT

Built 1934 Load: 29.0 t ADT: 418

EVANS RICEVILLE RD

Over: BELT CREEK 015

12M N MONARCH, Cascade, MT

Built 1962 Load: 29.9 t ADT: 100

A-6 LANE

Over: BELT CREEK

4.8 KM SE OF MONARCH, Cascade, MT

Built 1960 Load: 30.8 t ADT: 20

CORA CREEK RD

Over: CORA CREEK 075

7M SE BELT, Cascade, MT

Built 1950 Load: 30.8 t ADT: 100

SIMMS ASHUELOT RD

Over: BLACKFOOT COULEE 053

2M NE SIMMS, Cascade, MT

Built 1976 Load: 31.8 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