Madison County, MT

84 public highway bridges

Madison County Bridge Snapshot

Madison County, Montana contains 84 public highway bridges in the FHWA National Bridge Inventory. Roughly 26.2% are rated “Good,” 53.6% “Fair,” 13.1% “Poor,” and 13.1% 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.

84

Total Bridges

26.2%

Good

13.1%

Poor

13.1%

Structurally Deficient

Condition Distribution

Good

26.2% (22)

Fair

53.6% (45)

Poor

13.1% (11)

SD

13.1% (11)

All Bridges (84)

Sort:

I 15

Over: RR-HWY 91- DRAINAGE

6.8M S MELROSE, Madison, MT

Built 1974 ADT: 155

I 15

Over: RR-HWY 91-DRAINAGE

6.8M S MELROSE, Madison, MT

Built 1974 ADT: 155

I 15

Over: SEP MELROSE RD

1.9M S MELROSE, Madison, MT

Built 1973 ADT: 81

I 15

Over: SEP MELROSE RD

1.9M S MELROSE, Madison, MT

Built 1973 ADT: 81

I 15

Over: INT MELROSE-HWY 91

MELROSE, Madison, MT

Built 1973 ADT: 100

I 15

Over: INT MELROSE-HWY 91

MELROSE, Madison, MT

Built 1973 ADT: 100

SUNDANCE BENCH RD

Over: MADISON RIVER 046

31M S ENNIS, Madison, MT

Built 1902 Load: 4.5 t ADT: 100

BURMA RD

Over: BIG HOLE RIVER 014

14M NW SHERIDAN, Madison, MT

Built 1987 Load: 8.2 t ADT: 100

FDR #1205

Over: NO DATA ENTERED

GRANITE MOUNTAIN, Madison, MT

Built 1985 Load: 13.9 t ADT: 50

S 87

Over: MADISON RIVER

29M SE CAMERON, Madison, MT

Built 1961 Load: 15.4 t ADT: 1,394

RUBY ROAD

Over: MIDDLE FK RUBY RIVE

M FK RUBY RIVER, Madison, MT

Built 1947 Load: 16.5 t ADT: 50

S BOULDER RD

Over: UPR S BOULDER RIVER 055

4M S JEFFERSON ISLAND, Madison, MT

Built 2003 Load: 17.2 t ADT: 100

NO DATA ENTERED

Over: BURNT CR

BURNT CR, Madison, MT

Built 1947 Load: 19.1 t ADT: 50

BURMA RD

Over: BIG HOLE RIVER 015

14M NW SHERIDAN, Madison, MT

Built 1987 Load: 20.0 t ADT: 100

RUBY-CENTENNTIAL

Over: EAST FK RUBY RIVER

EAST FK RUBY RIVER, Madison, MT

Built 1954 Load: 20.1 t ADT: 50

KOUNTZ RD

Over: JEFFERSON RIVER 017

3M E WHITEHALL, Madison, MT

Built 1973 Load: 21.8 t ADT: 264

S 359

Over: BRICKER SPARROW DITCH

JEFFERSON ISLAND, Madison, MT

Built 1958 Load: 22.7 t ADT: 1,402

CLIFF LAKE RD

Over: MADISON RIVER 045

36M S ENNIS, Madison, MT

Built 2001 Load: 23.6 t ADT: 100

S 287

Over: ALDER CREEK

LAURIN, Madison, MT

Built 1940 Load: 23.6 t ADT: 1,862

S 287

Over: RAMSHORN CREEK

2M N LAURIN, Madison, MT

Built 1940 Load: 24.5 t ADT: 1,862

S 41

Over: JEFFERSON RIVER

3M S SILVERSTAR, Madison, MT

Built 1992 Load: 24.5 t ADT: 1,899

S 41

Over: BEAVERHEAD RIVER

12M SW TWIN BRIDGES, Madison, MT

Built 1949 Load: 24.5 t ADT: 2,326

MELROSE RD

Over: BIG HOLE RIVER 036

2M W TWIN BRIDGES, Madison, MT

Built 1978 Load: 25.4 t ADT: 154

S 359

Over: JEFFERSON RIVER

JEFFERSON ISLAND, Madison, MT

Built 1967 Load: 25.4 t ADT: 1,402

PRIMROSE LN

Over: JEFFERSON RIVER

SILVER STAR, Madison, MT

Built 2003 Load: 25.6 t ADT: 108

S WILLOW CREEK RD

Over: SOUTH WILLOW CREEK 064

4M S PONY, Madison, MT

Built 2003 Load: 27.2 t ADT: 100

DUNCAN DISTRICT RD

Over: RUBY RIVER 022

4M SW SHERIDAN, Madison, MT

Built 2010 Load: 27.2 t ADT: 100

US 287

Over: INDIAN CREEK

7M S CAMERON, Madison, MT

Built 1933 Load: 27.2 t ADT: 1,789

SPANISH CREEK ROAD

Over: NORTH FORK SPANISH CREEK

SPANISH CREEK, Madison, MT

Built 1967 Load: 27.5 t ADT: 50

US 287

Over: MADISON RIVER

ENNIS, Madison, MT

Built 2001 Load: 28.1 t ADT: 4,210

JACK CREEK RD

Over: JACK CREEK 027

10M E ENNIS, Madison, MT

Built 1952 Load: 29.0 t ADT: 175

US 287

Over: SOUTH WILLOW CREEK

HARRISON, Madison, MT

Built 1934 Load: 29.9 t ADT: 4,026

MT 41

Over: BEAVERHEAD RIVER

TWIN BRIDGES, Madison, MT

Built 1949 Load: 29.9 t ADT: 2,773

S 84

Over: CHERRY CREEK

9M NE NORRIS, Madison, MT

Built 1952 Load: 29.9 t ADT: 2,446

I 15

Over: BIG HOLE RIVER

7.4M S MELROSE, Madison, MT

Built 1973 Load: 31.1 t ADT: 1,902

I 15

Over: BIG HOLE RIVER

7.4M S MELROSE, Madison, MT

Built 1973 Load: 31.1 t ADT: 1,902

NO DATA ENTERED

Over: COAL CR

COAL CR, Madison, MT

Built 1950 Load: 31.8 t ADT: 40

S 287

Over: WATER GULCH

4M NW VIRGINIA CITY, Madison, MT

Built 1942 Load: 31.8 t ADT: 1,151

KOUNTZ RD

Over: JEFFERSON RIV OVRFLW 016

2M S WHITEHALL, Madison, MT

Built 1977 Load: 32.7 t ADT: 264

LEWIS LN

Over: RUBY RIVER 021

5M W SHERIDAN, Madison, MT

Built 1975 Load: 32.7 t ADT: 247

COTTONWOOD CREEK R

Over: RUBY RIVER 061

9M S ALDER, Madison, MT

Built 1984 Load: 32.7 t ADT: 100

SWEETWATER RD

Over: RUBY RIVER 059

11M S ALDER, Madison, MT

Built 1998 Load: 32.7 t ADT: 100

PRIMROSE LN

Over: JEFFERSON RIVER OVERFLOW

2M E SILVERSTAR, Madison, MT

Built 1977 Load: 32.7 t ADT: 108

LEDFORD CREEK RD

Over: RUBY RIVER 058

17M S ALDER, Madison, MT

Built 1960 Load: 33.4 t ADT: 100

JACK CR BENCH RD

Over: JACK CREEK 031

7M E ENNIS, Madison, MT

Built 1952 Load: 33.6 t ADT: 175

JOHNNY RIDGE RD

Over: MADISON RIVER 001

7M S CAMERON, Madison, MT

Built 1967 Load: 34.5 t ADT: 409

S 359

Over: SOUTH BOULDER RIVER

3M S JEFFERSON ISLAND, Madison, MT

Built 1958 Load: 34.5 t ADT: 1,402

S 287

Over: WISCONSIN CREEK

3M NW SHERIDAN, Madison, MT

Built 1999 Load: 36.3 t ADT: 1,866

ENNIS LAKE RD

Over: MADISON RIVER 032

4M E MCALLISTER, Madison, MT

Built 1990 Load: 39.9 t ADT: 383

JUDY LN

Over: RUBY RIVER 026

W OF ALDER, Madison, MT

Built 1984 Load: 49.0 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