Lewis and Clark County, MT

196 public highway bridges

Lewis and Clark County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Lewis and Clark County, Montana contains 196 public highway bridges. Roughly 51.5% are rated “Good,” 30.6% “Fair,” and 4.6% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

196
Total Bridges
51.5%
Good
30.6%
Fair
4.6%
Poor Condition

Condition Distribution

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

All Bridges (196)

I 15

Unknown

Over: SEP SIERRA RD E

4M N HELENA, Lewis and Clark, MT

Built 1962 ADT: 3,264

I 15

Unknown

Over: SEP SIERRA RD E

4M N HELENA, Lewis and Clark, MT

Built 1962 ADT: 3,264

I 15

Unknown

Over: INT GATES OF THE MTNS

17M S WOLF CREEK, Lewis and Clark, MT

Built 1962 ADT: 431

I 15

Unknown

Over: INT GATES OF THE MTNS

17M S WOLF CREEK, Lewis and Clark, MT

Built 1962 ADT: 431

I 15

Unknown

Over: INT SEIBEN

10M S WOLF CREEK, Lewis and Clark, MT

Built 1962 ADT: 37

I 15

Unknown

Over: INT SEIBEN

10M S WOLF CREEK, Lewis and Clark, MT

Built 1962 ADT: 37

I 15

Unknown

Over: INT SPRING CREEK-RR

7M S WOLF CREEK, Lewis and Clark, MT

Built 1964 ADT: 30

I 15

Unknown

Over: INT SPRING CREEK-RR

7M S WOLF CREEK, Lewis and Clark, MT

Built 1964 ADT: 30

I 15

Unknown

Over: SEP LYONS CREEK ROAD

6M S WOLF CREEK, Lewis and Clark, MT

Built 1964 ADT: 100

I 15

Unknown

Over: SEP LYONS CREEK ROAD

6M S WOLF CREEK, Lewis and Clark, MT

Built 1964 ADT: 100

I 15

Unknown

Over: INT WOLF CREEK

WOLF CREEK, Lewis and Clark, MT

Built 1966 ADT: 421

I 15

Unknown

Over: INT WOLF CREEK

WOLF CREEK, Lewis and Clark, MT

Built 1966 ADT: 421

I 15

Unknown

Over: INT CRAIG

CRAIG, Lewis and Clark, MT

Built 1967 ADT: 773

I 15

Unknown

Over: INT CRAIG

CRAIG, Lewis and Clark, MT

Built 1967 ADT: 773

I 15

Unknown

Over: SEP MISSOURI RVR-CO RD

2M N CRAIG, Lewis and Clark, MT

Built 1967 ADT: 327

I 15

Unknown

Over: SEP MISSOURI RVR-CO RD

2M N CRAIG, Lewis and Clark, MT

Built 1967 ADT: 327

I 15

Unknown

Over: MISSOURI RVR-RR-LOCAL

5M N CRAIG, Lewis and Clark, MT

Built 1971 ADT: 327

I 15

Unknown

Over: MISSOURI RVR-RR-LOCAL

5M N CRAIG, Lewis and Clark, MT

Built 1971 ADT: 327

SADDLE DRIVE

Unknown

Over: S HELENA INT I 15 156

1M S HELENA, Lewis and Clark, MT

Built 2007 ADT: 7,626

S HOWIE ST

Unknown

Over: REEDERS ALLEY 001

HELENA-REEDERS ALLEY, Lewis and Clark, MT

Built 1881 ADT: 100

PROSPECT AVE-US 12

Unknown

Over: INT CAPITOL-I 15

HELENA-PROSPECT AVE, Lewis and Clark, MT

Built 1961 ADT: 7,626

PROSPECT AVE-US 12

Unknown

Over: INT CAPITOL-I 15

HELENA-PROSPECT AVE, Lewis and Clark, MT

Built 1961 ADT: 11,699

US 287

Unknown

Over: INT AUGUSTA I 15

1M NE WOLF CREEK, Lewis and Clark, MT

Built 1966 ADT: 2,522

LINCOLN RD

Unknown

Over: INT LINCOLN-I 15

10M N HELENA, Lewis and Clark, MT

Built 1962 ADT: 2,340

E CUSTER AVE

Unknown

Over: INT CUSTER AVE-I 15

HELENA-E CUSTER AVE, Lewis and Clark, MT

Built 2012 ADT: 6,190

CEDAR ST

Unknown

Over: INT CEDAR ST-I 15

HELENA-CEDAR ST, Lewis and Clark, MT

Built 2002 ADT: 9,322

BIRDTAIL RD

Fair

Over: FLAT CREEK 036

8M SE BOWMANS, Lewis and Clark, MT

Built 1901 Load: 2.7 t ADT: 100

AUGUSTA RD

Fair

Over: DEARBORN RIVER 011

18M S AUGUSTA, Lewis and Clark, MT

Built 1896 Load: 4.2 t ADT: 31

CHEVALLIER DR

Fair

Over: LITTLE PRICKLY PEAR 109

7M SW SIEBEN INT, Lewis and Clark, MT

Built 1905 Load: 4.5 t ADT: 37

MCDONALD LN

Fair

Over: LTL PRICKLY PEAR CRK 151

3M W CANYON CREEK, Lewis and Clark, MT

Built 1990 Load: 4.5 t ADT: 100

AUGUSTA-CLEMONS RD

Fair

Over: ELK CREEK 029

2M SW AUGUSTA, Lewis and Clark, MT

Built 1915 Load: 7.3 t ADT: 100

HEAD LN

Fair

Over: SEVEN MILE CREEK 149

5M NW HELENA, Lewis and Clark, MT

Built 1982 Load: 11.0 t ADT: 352

HART LN

Fair

Over: HELENA VALLEY CANAL 088

4M NE EAST HELENA, Lewis and Clark, MT

Built 1957 Load: 14.5 t ADT: 126

S 200

Fair

Over: DEARBORN RIVER

25M SW SIMMS, Lewis and Clark, MT

Built 1949 Load: 17.2 t ADT: 1,382

MINNEHAHA ROAD

Fair

Over: TEN MILE CREEK

INTERSECT MINNEHAHA&TENMI, Lewis and Clark, MT

Built 1955 Load: 18.1 t ADT: 30

BEAVER CREEK ROAD

Fair

Over: BEAVER CREEK

BEAVER CREEK 3, Lewis and Clark, MT

Built 2004 Load: 18.5 t ADT: 50

HOGUM CK ROAD

Fair

Over: BLACKFOOT RIVER

HOGUM-BLACKFOOT, Lewis and Clark, MT

Built 1965 Load: 18.8 t ADT: 46

HOGUM CK ROAD

Fair

Over: HOGUM CREEK

HOGUM, Lewis and Clark, MT

Built 1962 Load: 19.1 t ADT: 46

YORK RD

Fair

Over: MISSOURI RIVER

14M NE HELENA, Lewis and Clark, MT

Built 1982 Load: 19.1 t ADT: 470

SUCKER KP KL ROAD

Fair

Over: COPPER CREEK

KEEP KOOL-COPPER, Lewis and Clark, MT

Built 1962 Load: 19.4 t ADT: 34

US 287

Fair

Over: DEARBORN RIVER

14M NW WOLF CREEK, Lewis and Clark, MT

Built 1963 Load: 20.0 t ADT: 457

N MONTANA AVE

Fair

Over: HELENA VALLEY CANAL

1M N HELENA, Lewis and Clark, MT

Built 1958 Load: 20.0 t ADT: 11,526

NFSR 330

Fair

Over: LANDERS FORK

LANDERS FORK, Lewis and Clark, MT

Built 1977 Load: 21.7 t ADT: 21

APPLEGATE DR

Fair

Over: HELENA VALLEY CANAL 115

6M NW HELENA, Lewis and Clark, MT

Built 1958 Load: 21.8 t ADT: 1,526

S CRUSE AVE

Fair

Over: PEDESTRIAN UNDERPASS

HELENA-S CRUSE AVE, Lewis and Clark, MT

Built 1972 Load: 21.8 t ADT: 1,580

CRAIG FRONTAGE RD

Fair

Over: WEGNER CREEK 055

CRAIG, Lewis and Clark, MT

Built 1934 Load: 23.6 t ADT: 327

S 200

Fair

Over: LANDERS FORK

4M NE LINCOLN, Lewis and Clark, MT

Built 1938 Load: 23.6 t ADT: 1,982

LINCOLN RD W

Fair

Over: LITTLE PRICKLY PEAR CR

2M NW CANYON CREEK, Lewis and Clark, MT

Built 1949 Load: 23.6 t ADT: 394

LINCOLN RD W

Fair

Over: CANYON CREEK

6M NW CANYON CREEK, Lewis and Clark, MT

Built 1949 Load: 23.6 t ADT: 394

NELSON RD

Fair

Over: BEAVER CREEK 121

NELSON, Lewis and Clark, MT

Built 1975 Load: 24.4 t ADT: 233

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

Related

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.