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:

I 15

Over: INT DEARBORN-MISSOURI R

6M N CRAIG, Cascade, MT

Built 1971 ADT: 100

I 15

Over: INT DEARBORN-MISSOURI R

6M N CRAIG, Cascade, MT

Built 1971 ADT: 100

I 15

Over: MISSOURI RIVER-LOCAL

7M N CRAIG, Cascade, MT

Built 1971 ADT: 50

I 15

Over: MISSOURI RIVER-LOCAL

7M N CRAIG, Cascade, MT

Built 1971 ADT: 100

I 15

Over: INT HARDY-HARDY CREEK

7M S CASCADE, Cascade, MT

Built 1968 ADT: 314

I 15

Over: INT HARDY-HARDY CREEK

7M S CASCADE, Cascade, MT

Built 1968 ADT: 314

I 15

Over: SEP TINTINGER

5M S CASCADE, Cascade, MT

Built 1961 ADT: 100

I 15

Over: SEP TINTINGER

5M S CASCADE, Cascade, MT

Built 1978 ADT: 100

I 15

Over: SEP OLD US 91

3M S CASCADE, Cascade, MT

Built 1961 ADT: 314

I 15

Over: SEP OLD US 91

3M S CASCADE, Cascade, MT

Built 1978 ADT: 314

I 15

Over: INT S CASCADE

CASCADE, Cascade, MT

Built 1961 ADT: 100

I 15

Over: INT S CASCADE

CASCADE, Cascade, MT

Built 1978 ADT: 100

I 15

Over: INT N CASCADE

CASCADE, Cascade, MT

Built 1961 ADT: 100

I 15

Over: INT N CASCADE

CASCADE, Cascade, MT

Built 1977 ADT: 100

I 15

Over: INT ULM

ULM, Cascade, MT

Built 1958 ADT: 177

I 15

Over: INT ULM

ULM, Cascade, MT

Built 1969 ADT: 177

I 15

Over: SEP COUNTY ROAD

3M N ULM, Cascade, MT

Built 1969 ADT: 100

I 15

Over: SEP COUNTY ROAD

3M N ULM, Cascade, MT

Built 1969 ADT: 100

I 15

Over: SEP 5TH AVE SW

GREAT FALLS, Cascade, MT

Built 1967 ADT: 640

I 15

Over: SEP 5TH AVE SW

GREAT FALLS, Cascade, MT

Built 1967 ADT: 640

I 15

Over: INT EMERSON JCT-RR

1M N GREAT FALLS, Cascade, MT

Built 1967 ADT: 6,717

I 15

Over: INT EMERSON JCT-RR

1M N GREAT FALLS, Cascade, MT

Built 1967 ADT: 6,717

I 15

Over: INT MANCHESTER

4M S VAUGHN, Cascade, MT

Built 1960 ADT: 100

I 15

Over: INT MANCHESTER

4M S VAUGHN, Cascade, MT

Built 1960 ADT: 100

I 15

Over: SEP NEUMAN SCH RD

2M N VAUGHN, Cascade, MT

Built 1972 ADT: 100

I 15

Over: SEP NEUMAN SCH RD

2M N VAUGHN, Cascade, MT

Built 1972 ADT: 100

I 15

Over: SEP GUNDERSON RD

2M S POWER, Cascade, MT

Built 1972 ADT: 100

I 15

Over: SEP GUNDERSON RD

2M S POWER, Cascade, MT

Built 1972 ADT: 100

I 315S

Over: INT I 15

GREAT FALLS, Cascade, MT

Built 1967 ADT: 6,889

I 315S

Over: FAU 5225-14TH ST SW

GREAT FALLS, Cascade, MT

Built 1967 ADT: 9,271

I 315S

Over: FAU 5225-14TH ST SW

GREAT FALLS, Cascade, MT

Built 1967 ADT: 3,395

I 315 S

Over: FAU 5225-14TH ST SW

GREAT FALLS, Cascade, MT

Built 1997 ADT: 9,271

ANDERSON RD

Over: INT GORDON-I 15

6M NW VAUGHN, Cascade, MT

Built 1972 ADT: 2,000

OLD ULM CASCADE RD

Over: SEP I 15

6M NE CASCADE, Cascade, MT

Built 1977 ADT: 4,847

OLD ULM CASCADE RD

Over: SEP I 15

3M SW ULM, Cascade, MT

Built 1970 ADT: 2,424

FRONTAGE ROAD 614

Over: INT SEP I 15

4M SW CASCADE, Cascade, MT

Built 1978 ADT: 2,189

FRONTAGE ROAD 615

Over: INT CANYON-I 15

11M SW CASCADE, Cascade, MT

Built 1968 ADT: 2,224

34TH ST NW

Over: SEP 34TH ST-I 15

1M W GREAT FALLS, Cascade, MT

Built 1967 ADT: 3,244

SUN RIVER RD

Over: SEP WEST HILL-I 15 127

GREAT FALLS, Cascade, MT

Built 1967 ADT: 5,101

US 89

Over: INT VAUGHN-I 15

VAUGHN, Cascade, MT

Built 1960 ADT: 4,297

US 87-MT 3-MT 200

Over: MISSOURI RIVER-U5205-RR

GREAT FALLS-10TH AVE S, Cascade, MT

Built 1983 ADT: 5,718

US 89-MT 3-MT 200

Over: MISSOURI RIVER-U5205-RR

GREAT FALLS-10TH AVE S, Cascade, MT

Built 1951 ADT: 5,718

SMELTER AVE

Over: 15TH ST NE

BLACK EAGLE-SMELTER AVE, Cascade, MT

Built 1963 ADT: 11,678

CENTRAL AVE W

Over: INT CENTRAL AVE W-I 15

GREAT FALLS-CENTRAL AVE W, Cascade, MT

Built 1967 ADT: 3,244

CENTRAL AVE W

Over: GALT AVE-RR

GREAT FALLS-CENTRAL AVE W, Cascade, MT

Built 1967 ADT: 689

CENTRAL AVE W

Over: GALT AVE-RR

GREAT FALLS-CENTRAL AVE W, Cascade, MT

Built 1967 ADT: 689

AIRPORT DR

Over: INT GORE HILL-I 15

1M SW GREAT FALLS, Cascade, MT

Built 1967 ADT: 3,053

NFSR 834

Over: BELT CREEK

JCT US 89/NFSR 834, Cascade, MT

Built 1909 ADT: 99

NFSR 1049

Over: BELT CREEK

EAST OF JCT US89/NFSR1049, Cascade, MT

Built 1909 ADT: 99

LOWREY RD

Over: SUN RIVER 062

5M NW SIMMS, Cascade, MT

Built 1960 Load: 12.7 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