Lewis and Clark County, MT

196 public highway bridges

Lewis and Clark County Bridge Snapshot

Lewis and Clark County, Montana contains 196 public highway bridges in the FHWA National Bridge Inventory. Roughly 51.5% are rated “Good,” 30.6% “Fair,” 4.6% “Poor,” and 4.6% 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.

196
Total Bridges
51.5%
Good
4.6%
Poor
4.6%
Structurally Deficient

Condition Distribution

Good
51.5% (101)
Fair
30.6% (60)
Poor
4.6% (9)
SD
4.6% (9)

All Bridges (196)

S RECREATION RD

Fair

Over: SHEEP CREEK 117

2M S WOLF CREEK, Lewis and Clark, MT

Built 1933 Load: 24.5 t ADT: 390

LAKE HELENA DR

Fair

Over: CAUSEWAY-LAKE HELENA 072

8M N EAST HELENA, Lewis and Clark, MT

Built 1944 Load: 24.5 t ADT: 861

GLASS DR

Fair

Over: HELENA VALLEY CANAL 150

11M N HELENA, Lewis and Clark, MT

Built 1958 Load: 24.5 t ADT: 615

STEMPLE PASS RD

Fair

Over: BLACKFOOT RIVER 118

.5M S LINCOLN, Lewis and Clark, MT

Built 1959 Load: 24.5 t ADT: 299

BEAVER CREEK RD

Fair

Over: KEEP COOL CREEK 094

1M W LINCOLN, Lewis and Clark, MT

Built 1957 Load: 25.4 t ADT: 100

WOODBRIDGE DRIVE

Fair

Over: DRAINAGE 002

HELENA-WOODBRIDGE DRIVE, Lewis and Clark, MT

Built 1975 Load: 25.4 t ADT: 100

S 435

Fair

Over: SMITH CREEK

4M SW AUGUSTA, Lewis and Clark, MT

Built 1958 Load: 25.4 t ADT: 33

BANNER CREEK RD

Fair

Over: RUBY CREEK

TEN MILE, Lewis and Clark, MT

Built 1964 Load: 25.9 t ADT: 60

COUNTY ROAD 061

Fair

Over: LEVINGS GULCH 158

1M N SIEBEN INT, Lewis and Clark, MT

Built 1933 Load: 27.2 t ADT: 13

US 287

Fair

Over: SUN RIVER

4M NE AUGUSTA, Lewis and Clark, MT

Built 1936 Load: 27.2 t ADT: 535

I 15

Fair

Over: LITTLE PRICKLY PEAR CR

9M S WOLF CREEK, Lewis and Clark, MT

Built 1965 Load: 28.2 t ADT: 2,383

NFSR 233

Fair

Over: BEAVER CREEK

BEAVER CREEK NO. 5, Lewis and Clark, MT

Built 1978 Load: 28.8 t ADT: 26

I 15

Fair

Over: STICKNEY CREEK

2M N CRAIG, Lewis and Clark, MT

Built 1968 Load: 28.8 t ADT: 2,224

S 21

Fair

Over: ELK CREEK 119

1M NE AUGUSTA, Lewis and Clark, MT

Built 1935 Load: 29.0 t ADT: 258

YORK RD

Fair

Over: PRICKLY PEAR CREEK

2M NE HELENA, Lewis and Clark, MT

Built 1941 Load: 29.0 t ADT: 5,244

CRAIG FRONTAGE RD

Fair

Over: STICKNEY CREEK 057

2M N CRAIG, Lewis and Clark, MT

Built 1968 Load: 29.9 t ADT: 327

E MAIN STREET

Fair

Over: PRICKLY PEAR CREEK 009

EAST HELENA-E MAIN ST, Lewis and Clark, MT

Built 1934 Load: 29.9 t ADT: 2,565

FIELDS GLCH ROAD

Fair

Over: POORMAN CREEK

FIELDS GULCH, Lewis and Clark, MT

Built 1979 Load: 30.8 t ADT: 20

LINCOLN RD W

Fair

Over: CANYON CREEK

5M NW CANYON CREEK, Lewis and Clark, MT

Built 1949 Load: 30.8 t ADT: 394

DEARBORN CANYON RD

Fair

Over: FALLS CREEK 049

2M SW BEAN LAKE, Lewis and Clark, MT

Built 1960 Load: 31.7 t ADT: 117

COUNTY ROAD 061

Fair

Over: LITTLE PRICKLY PEAR 111

1M N SIEBEN INT, Lewis and Clark, MT

Built 1962 Load: 31.8 t ADT: 13

S 21

Fair

Over: DRY CREEK 122

12M W SIMMS, Lewis and Clark, MT

Built 1935 Load: 31.8 t ADT: 258

UNKNOWN

Fair

Over: PRICKELY PEAR CREEK

5M NE HELENA, Lewis and Clark, MT

Built 1940 Load: 32.7 t ADT: 100

WYLIE DR

Fair

Over: HELENA VALLEY CANAL 081

2M N EAST HELENA, Lewis and Clark, MT

Built 1958 Load: 32.7 t ADT: 4,571

SIERRA ROAD E

Fair

Over: PRICKLY PEAR CREEK 077

5M NE HELENA, Lewis and Clark, MT

Built 1998 Load: 32.7 t ADT: 619

RIMINI RD

Fair

Over: TEN MILE CREEK 105

15M SW HELENA, Lewis and Clark, MT

Built 1981 Load: 32.7 t ADT: 230

RIMINI RD

Fair

Over: TEN MILE CREEK 106

1M S RIMINI, Lewis and Clark, MT

Built 1962 Load: 33.6 t ADT: 106

COUNTY ROAD 811

Fair

Over: TEN MILE CREEK 131

W EDGE OF HELENA, Lewis and Clark, MT

Built 2005 Load: 35.4 t ADT: 100

S 435

Fair

Over: ELK CREEK

6M SW AUGUSTA, Lewis and Clark, MT

Built 1958 Load: 36.3 t ADT: 33

FRONTAGE ROAD 295

Fair

Over: TEN MILE CREEK 071

2M N HELENA, Lewis and Clark, MT

Built 1962 Load: 43.5 t ADT: 1,755

Route 284

Fair

Over: Canyon Ferry Spillway

14 mi E-NE of Helena MT, Lewis and Clark, MT

Built 1950 Load: 44.1 t ADT: 600

S 200

Fair

Over: FLAT CREEK

16M SW SIMMS, Lewis and Clark, MT

Built 1986 Load: 85.3 t ADT: 1,455

I 15

Fair

Over: DOG CREEK

1M S CRAIG, Lewis and Clark, MT

Built 1967 Load: 89.8 t ADT: 4,253

I 15

Fair

Over: WOLF CREEK

WOLF CREEK, Lewis and Clark, MT

Built 1966 Load: 99.9 t ADT: 5,043

S 21

Fair

Over: SPRING CREEK COULEE 124

5M E AUGUSTA, Lewis and Clark, MT

Built 1982 Load: 99.9 t ADT: 258

US 287

Fair

Over: ROCK CREEK

3M NE WOLF CREEK, Lewis and Clark, MT

Built 1967 Load: 99.9 t ADT: 561

NO DATA ENTERED

Good

Over: BEAVER CREEK

NO DATA ENTERED, Lewis and Clark, MT

Built 2019 ADT: 50

NO DATA ENTERED

Good

Over: BEAVER CREEK

NO DATA ENTERED, Lewis and Clark, MT

Built 2018 ADT: 50

LOST HORSE CR RD

Good

Over: DEADMAN CREEK 098

7M SW CANYON CREEK, Lewis and Clark, MT

Built 1990 Load: 12.7 t ADT: 100

JOHN G MINE RD

Good

Over: HELENA VALLEY CANAL 116

6M NW HELENA, Lewis and Clark, MT

Built 1958 Load: 12.7 t ADT: 790

NORRIS RD

Good

Over: HELENA VALLEY CANAL 114

4M NW HELENA, Lewis and Clark, MT

Built 1958 Load: 15.4 t ADT: 488

COUNTY ROAD 290

Good

Over: HELENA VALLEY CANAL 085

N OF HELENA AIRPORT, Lewis and Clark, MT

Built 1958 Load: 17.2 t ADT: 100

LT PRICKLY PEAR RD

Good

Over: LTL PRICKLY PEAR CR 097

6M W CANYON CREEK, Lewis and Clark, MT

Built 1952 Load: 20.0 t ADT: 121

050438: SAUERKRAUT

Good

Over: Sauerkraut Creek

4.5 mi. W of Lincoln, MT, Lewis and Clark, MT

Built 2010 Load: 20.7 t ADT: 5

NFSR 233

Good

Over: WILLOW CREEK

LITTLE WILLOW CREEK, Lewis and Clark, MT

Built 2004 Load: 20.7 t ADT: 26

RIMINI RD

Good

Over: TEN MILE CREEK 101

11M W HELENA, Lewis and Clark, MT

Built 2015 Load: 21.4 t ADT: 230

NFSR 233

Good

Over: W FK BEAVER CREEK

BEAVER CREEK NO. 2, Lewis and Clark, MT

Built 1978 Load: 22.7 t ADT: 26

WYLIE DR

Good

Over: PRICKLY PEAR CREEK 080

1M N EAST HELENA, Lewis and Clark, MT

Built 1958 Load: 22.7 t ADT: 4,312

STEMPLE PASS RD

Good

Over: POORMAN CREEK 153

3M S LINCOLN, Lewis and Clark, MT

Built 2009 Load: 22.7 t ADT: 299

COPPER CREEK ROAD

Good

Over: COPPER CREEK

NO DATA ENTERED, Lewis and Clark, MT

Built 2005 Load: 23.7 t ADT: 169

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

Related

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial