Yellowstone County, MT

283 public highway bridges

Yellowstone County Bridge Snapshot

Yellowstone County, Montana contains 283 public highway bridges in the FHWA National Bridge Inventory. Roughly 28.3% are rated “Good,” 46.3% “Fair,” 1.1% “Poor,” and 1.1% 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.

283

Total Bridges

28.3%

Good

1.1%

Poor

1.1%

Structurally Deficient

Condition Distribution

Good

28.3% (80)

Fair

46.3% (131)

Poor

1.1% (3)

SD

1.1% (3)

All Bridges (283)

Sort:

I 90

Over: INT W LAUREL-RR

LAUREL, Yellowstone, MT

Built 2019 ADT: 725

19TH AVE W

Over: I-90

LAUREL, Yellowstone, MT

Built 2020 ADT: 18,639

I 90

Over: SEP WOLD ROAD

1.9M W LAUREL, Yellowstone, MT

Built 1967 ADT: 590

I 90

Over: SEP WOLD ROAD

1.9M W LAUREL, Yellowstone, MT

Built 1967 ADT: 590

I 90

Over: INT LAUREL-P 4-RR

LAUREL, Yellowstone, MT

Built 1964 ADT: 13,578

I 90

Over: INT LAUREL-P 4-RR

LAUREL, Yellowstone, MT

Built 1964 ADT: 13,578

I 90

Over: INT MOSSMAIN ROAD-P 4

3.1M E LAUREL, Yellowstone, MT

Built 1964 ADT: 5,491

I 90

Over: INT MOSSMAIN ROAD-P 4

3.1M E LAUREL, Yellowstone, MT

Built 1964 ADT: 5,491

I 90

Over: SEP S 56TH ST W

5.6M W BILLINGS, Yellowstone, MT

Built 1961 ADT: 2,281

I 90

Over: SEP S 56TH ST W

5.6M W BILLINGS, Yellowstone, MT

Built 1961 ADT: 2,281

I 90

Over: INT W BILLINGS-U 1020

BILLINGS, Yellowstone, MT

Built 1964 ADT: 11,531

I 90

Over: INT W BILLINGS-U 1020

BILLINGS, Yellowstone, MT

Built 1964 ADT: 11,531

I 90

Over: INT W BILLINGS-U 1010

BILLINGS, Yellowstone, MT

Built 1994 ADT: 13,366

I 90

Over: INT W BILLINGS-U 1010

BILLINGS, Yellowstone, MT

Built 1994 ADT: 26,731

I 90

Over: INT JOHNSON LANE

2.5M E BILLINGS, Yellowstone, MT

Built 1967 ADT: 5,545

I 90

Over: INT JOHNSON LANE

2.5M E BILLINGS, Yellowstone, MT

Built 1967 ADT: 5,545

I 90

Over: INT PINEHILL-I 94

3.7M E BILLINGS, Yellowstone, MT

Built 1967 ADT: 4,414

I 90

Over: OLD HARDIN RD

4.3M E BILLINGS, Yellowstone, MT

Built 1969 ADT: 100

I 90

Over: OLD HARDIN RD

4.3M E BILLINGS, Yellowstone, MT

Built 1969 ADT: 100

I 90

Over: SEP INDIAN CR FRONTAGE R

13M E BILLINGS, Yellowstone, MT

Built 1972 ADT: 100

I 90

Over: SEP INDIAN CR FRONTAGE R

13M E BILLINGS, Yellowstone, MT

Built 1972 ADT: 100

I 90

Over: INT ARROW CREEK

16.8M E BILLINGS, Yellowstone, MT

Built 1972 ADT: 100

I 90

Over: INT ARROW CREEK

16.8M E BILLINGS, Yellowstone, MT

Built 1972 ADT: 100

I 94

Over: DICKIE ROAD

3.7M E BILLINGS, Yellowstone, MT

Built 1967 ADT: 1,742

I 94

Over: DICKIE ROAD

3.7M E BILLINGS, Yellowstone, MT

Built 1967 ADT: 1,742

I 94

Over: INT HUNTLEY-S 522

HUNTLEY, Yellowstone, MT

Built 1967 ADT: 4,306

I 94

Over: INT HUNTLEY-S 522

HUNTLEY, Yellowstone, MT

Built 1967 ADT: 4,306

I 94

Over: S 8TH RD

3.7M E HUNTLEY, Yellowstone, MT

Built 1967 ADT: 164

I 94

Over: S 8TH RD

3.7M E HUNTLEY, Yellowstone, MT

Built 1967 ADT: 164

I 94

Over: INT BALLANTINE

BALLANTINE, Yellowstone, MT

Built 1968 ADT: 87

I 94

Over: INT BALLANTINE

BALLANTINE, Yellowstone, MT

Built 1968 ADT: 87

I 94

Over: RR-HIGHLINE CANAL RD

1.9M E BALLANTINE, Yellowstone, MT

Built 1968 ADT: 65

I 94

Over: RR-HIGHLINE CANAL RD

1.9M E BALLANTINE, Yellowstone, MT

Built 1968 ADT: 65

I 94

Over: EAST I RD

2.5M E BALLANTINE, Yellowstone, MT

Built 1968 ADT: 100

I 94

Over: EAST I RD

2.5M E BALLANTINE, Yellowstone, MT

Built 1968 ADT: 100

I 94

Over: S 25TH RD

3.7M W POMPEYS PILLAR, Yellowstone, MT

Built 1968 ADT: 35

I 94

Over: S 25TH RD

3.7M W POMPEYS PILLAR, Yellowstone, MT

Built 1968 ADT: 35

I 94

Over: CANE ST

1.9M E POMPEYS PILLAR, Yellowstone, MT

Built 1976 ADT: 100

I 94

Over: CANE ST

1.9M E POMPEYS PILLAR, Yellowstone, MT

Built 1976 ADT: 100

I 94

Over: S 39TH RD

4.3M E POMPEYS PILLAR, Yellowstone, MT

Built 1976 ADT: 100

I 94

Over: S 39TH RD

4.3M E POMPEYS PILLAR, Yellowstone, MT

Built 1976 ADT: 100

I 94

Over: S 44TH RD

6.8M E POMPEYS PILLAR, Yellowstone, MT

Built 1976 ADT: 100

I 94

Over: S 44TH RD

6.8M E POMPEYS PILLAR, Yellowstone, MT

Built 1976 ADT: 100

I 94

Over: BULL MOUNTAIN RD

8M E POMPEYS PILLAR, Yellowstone, MT

Built 1976 ADT: 100

I 94

Over: BULL MOUNTAIN RD

8M E POMPEYS PILLAR, Yellowstone, MT

Built 1976 ADT: 100

I 94

Over: SPRING CREEK ROAD

11.2M E POMPEYS PILLAR, Yellowstone, MT

Built 1973 ADT: 100

I 94

Over: SPRING CREEK ROAD

11.2M E POMPEYS PILLAR, Yellowstone, MT

Built 1973 ADT: 100

I 94

Over: INT WACO-CO ROAD

11.2M W CUSTER, Yellowstone, MT

Built 1973 ADT: 100

I 94

Over: INT WACO-CO ROAD

11.2M W CUSTER, Yellowstone, MT

Built 1973 ADT: 100

I 94

Over: INT CUSTER-S 310

CUSTER, Yellowstone, MT

Built 1973 ADT: 118

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