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)

ELK CREEK RD

Good

Over: ELK CREEK 043

10M SW AUGUSTA, Lewis and Clark, MT

Built 2010 Load: 24.5 t ADT: 100

COPPER CREEK ROAD

Good

Over: COPPER CREEK

NO DATA ENTERED, Lewis and Clark, MT

Built 2005 Load: 24.9 t ADT: 10

CHEVALLIER DR

Good

Over: LITTLE PRICKLY PEAR 110

5M SW SIEBEN INT, Lewis and Clark, MT

Built 2012 Load: 25.4 t ADT: 37

NFSR 233

Good

Over: M FK BEAVER CREEK

BEAVER CREEK NO. 4, Lewis and Clark, MT

Built 1978 Load: 25.6 t ADT: 26

NFSR 330

Good

Over: COPPER CREEK

COPPER CREEK, Lewis and Clark, MT

Built 2008 Load: 25.9 t ADT: 169

I 15

Good

Over: LITTLE PRICKLY PEAR CR

9M S WOLF CREEK, Lewis and Clark, MT

Built 1965 Load: 25.9 t ADT: 2,383

LITTLE WOLF CR RD

Good

Over: WOLF CREEK 145

7M NW WOLF CREEK, Lewis and Clark, MT

Built 2007 Load: 26.3 t ADT: 128

S 200

Good

Over: MIDDLE FK DEARBORN RIVER

25M NE LINCOLN, Lewis and Clark, MT

Built 1993 Load: 26.3 t ADT: 1,356

BARR CREEK RD

Good

Over: N FORK WILLOW CREEK 125

9M NW AUGUSTA, Lewis and Clark, MT

Built 1991 Load: 27.2 t ADT: 100

LITTLE WOLF CR RD

Good

Over: WOLF CREEK 112

4M NW WOLF CREEK, Lewis and Clark, MT

Built 2010 Load: 28.1 t ADT: 128

FRONTAGE ROAD 241

Good

Over: LITTLE PRICKLY PEAR 059

WOLF CREEK, Lewis and Clark, MT

Built 1966 Load: 28.1 t ADT: 707

STEMPLE PASS RD

Good

Over: POORMAN CREEK 140

4M S LINCOLN, Lewis and Clark, MT

Built 2007 Load: 28.1 t ADT: 95

SPRING CREEK LN

Good

Over: SPRING CREEK 152

LINCOLN, Lewis and Clark, MT

Built 2010 Load: 28.1 t ADT: 100

BIRDSEYE RD

Good

Over: SEVEN MILE CREEK 034

6M NW HELENA, Lewis and Clark, MT

Built 2001 Load: 28.2 t ADT: 1,823

I 15

Good

Over: STICKNEY CREEK

2M N CRAIG, Lewis and Clark, MT

Built 1968 Load: 28.5 t ADT: 2,224

DEER MEADOW DR

Good

Over: TEN MILE CREEK 130

10M SW HELENA, Lewis and Clark, MT

Built 2006 Load: 28.6 t ADT: 100

FLAT CREEK RD

Good

Over: FLAT CREEK 017

5M NE BEAN LAKE, Lewis and Clark, MT

Built 2007 Load: 28.8 t ADT: 38

FLAT CREEK RD

Good

Over: FLAT CREEK 134

8M NE BEAN LAKE, Lewis and Clark, MT

Built 2006 Load: 29.0 t ADT: 38

STEMPLE PASS RD

Good

Over: POORMAN CREEK 147

9M S LINCOLN, Lewis and Clark, MT

Built 2004 Load: 29.0 t ADT: 95

STEMPLE PASS RD

Good

Over: POORMAN CREEK 148

10M S LINCOLN, Lewis and Clark, MT

Built 2004 Load: 29.0 t ADT: 95

NFSR 233

Good

Over: W FK BEAVER CREEK

BEAVER CREEK NO. 3, Lewis and Clark, MT

Built 1978 Load: 29.2 t ADT: 26

BRIDGE ST

Good

Over: MISSOURI RIVER 062

CRAIG, Lewis and Clark, MT

Built 2006 Load: 29.9 t ADT: 773

GREEN MEADOW DR

Good

Over: TEN MILE CREEK

1M N HELENA, Lewis and Clark, MT

Built 1992 Load: 29.9 t ADT: 4,808

GREEN MEADOW DR

Good

Over: HELENA VALLEY CANAL

2M N HELENA, Lewis and Clark, MT

Built 1992 Load: 29.9 t ADT: 4,483

NFSR 330-A1

Good

Over: SNOWBANK CREEK

COPPER CREEK AREA, Lewis and Clark, MT

Built 2013 Load: 30.8 t ADT: 40

S 200

Good

Over: ALICE CREEK

9M NE LINCOLN, Lewis and Clark, MT

Built 2014 Load: 30.8 t ADT: 1,761

NFSR 233

Good

Over: BEAVER CREEK

BEAVER CREEK NO. 6, Lewis and Clark, MT

Built 1978 Load: 31.1 t ADT: 26

STEMPLE PASS ROAD

Good

Over: POORMAN CREEK

6M S LINCOLN, Lewis and Clark, MT

Built 2021 Load: 31.8 t ADT: 95

CANYON FERRY RD

Good

Over: PRICKLY PEAR CREEK

1M E HELENA, Lewis and Clark, MT

Built 2001 Load: 31.8 t ADT: 10,679

MARSH CREEK RD

Good

Over: LTL PRICKLY PEAR CR 096

5M W CANYON CREEK, Lewis and Clark, MT

Built 1976 Load: 32.4 t ADT: 100

KEIR LN

Good

Over: SPOKANE CREEK 143

4M SW CANYON FERRY, Lewis and Clark, MT

Built 2004 Load: 32.5 t ADT: 100

LAKE HELENA DR

Good

Over: HELENA VALLEY CANAL 073

2M N EAST HELENA, Lewis and Clark, MT

Built 2004 Load: 32.7 t ADT: 4,240

VALLEY DR

Good

Over: HELENA VALLEY CANAL 074

2M N EAST HELENA, Lewis and Clark, MT

Built 2000 Load: 32.7 t ADT: 3,171

SIERRA ROAD E

Good

Over: TEN MILE CREEK 076

5M NE HELENA, Lewis and Clark, MT

Built 2001 Load: 32.7 t ADT: 619

BEAVER CREEK RD

Good

Over: BEAVER CREEK 142

2M W NELSON, Lewis and Clark, MT

Built 2001 Load: 32.7 t ADT: 100

LITTLE WOLF CR RD

Good

Over: WOLF CREEK 146

6M NW WOLF CREEK, Lewis and Clark, MT

Built 2007 Load: 32.7 t ADT: 128

LYONS CREEK RD

Good

Over: LITTLE PRICKLY PEAR 005

5M S WOLF CREEK, Lewis and Clark, MT

Built 2001 Load: 32.7 t ADT: 100

ELK CREEK RD

Good

Over: ELK CREEK 021

9M SW AUGUSTA, Lewis and Clark, MT

Built 2002 Load: 32.7 t ADT: 34

SMITH CREEK RD

Good

Over: SMITH CREEK 023

8M SW AUGUSTA, Lewis and Clark, MT

Built 2002 Load: 32.7 t ADT: 100

RIMINI RD

Good

Over: TEN MILE CREEK 104

14M SW HELENA, Lewis and Clark, MT

Built 1981 Load: 32.7 t ADT: 230

APPLEGATE DR

Good

Over: SILVER CREEK 144

5M NW HELENA, Lewis and Clark, MT

Built 2005 Load: 32.7 t ADT: 507

E RIGGS ST

Good

Over: PRICKLY PEAR CREEK 083

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

Built 1982 Load: 32.7 t ADT: 314

MCHUGH LN

Good

Over: HELENA VALLEY CANAL 086

2M N HELENA, Lewis and Clark, MT

Built 2000 Load: 32.7 t ADT: 1,882

COUNTRY CLUB AVE

Good

Over: TEN MILE CREEK 113

3M W HELENA, Lewis and Clark, MT

Built 2000 Load: 32.7 t ADT: 2,975

VALLEY FORGE RD

Good

Over: TEN MILE CREEK 126

HELENA-VALLEY FORGE RD, Lewis and Clark, MT

Built 1988 Load: 32.7 t ADT: 100

LYNDALE AVE-US 12

Good

Over: GREAT NORTHERN AREA

HELENA-LYNDALE AVE, Lewis and Clark, MT

Built 2003 Load: 32.7 t ADT: 20,843

US 287

Good

Over: FLAT CREEK

14M SE AUGUSTA, Lewis and Clark, MT

Built 2007 Load: 32.7 t ADT: 426

S 200

Good

Over: BEAVER CREEK

2M W LINCOLN, Lewis and Clark, MT

Built 1993 Load: 32.7 t ADT: 2,066

S 200

Good

Over: KEEP COOL CREEK

2M W LINCOLN, Lewis and Clark, MT

Built 1993 Load: 32.7 t ADT: 2,066

GREEN MEADOW DR

Good

Over: HELENA VALLEY CANAL

4M N HELENA, Lewis and Clark, MT

Built 2000 Load: 32.7 t ADT: 4,165

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