State profile · Below median Poor share

Idaho bridge safety

Condition ratings, load ratings, and Poor-condition data for every public highway bridge in Idaho, based on the FHWA National Bridge Inventory.

1,742
Public bridges
33.3%
Good condition
5.5%
Poor condition

Data updated May 2026

Total Bridges

1,742

Public highway bridges in Idaho

Good Condition

33.3%

580 bridges rated 7-9

-16.7pp vs 50% benchmark

Poor Condition

5.5%

96 bridges whose lowest applicable component is rated 0-4

-1.5pp vs national avg 7.0%

Idaho vs national bridge condition

Idaho - Good condition share 33.3%
National avg

Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).

Idaho - Poor-condition share 18.4%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.

Condition Distribution

Idaho35.4%58.7%GoodFairPoor
Bridge inventory deck-condition mix - Idaho (FHWA NBI)

Counties (44)

Ada 81 Adams 42 Bannock 25 Bear Lake 13 Benewah 15 Bingham 75 Blaine 39 Boise 41 Bonner 47 Bonneville 50 Boundary 52 Butte 14 Camas 26 Canyon 77 Caribou 12 Cassia 38 Clark 18 Clearwater 65 Custer 81 Elmore 45 Franklin 4 Fremont 46 Gem 16 Gooding 25 Idaho 130 Jefferson 55 Jerome 26 Kootenai 60 Latah 26 Lemhi 73 Lewis 6 Lincoln 16 Madison 27 Minidoka 19 Nez Perce 19 Oneida 2 Owyhee 20 Payette 9 Power 13 Shoshone 139 Teton 13 Twin Falls 35 Valley 82 Washington 25

Idaho vs nearby ranks

Adjacent states by Poor-condition share (lower share = better)

States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below Idaho on the same metric.

KS

Kansas

5.25% top marginal rate
Structure
Progressive
Burden @ $100K
$23,867

WY

Wyoming

5.41% top marginal rate
Structure
Progressive
Burden @ $100K
$3,181
Selected

ID

Idaho

5.51% top marginal rate
Structure
Progressive
Burden @ $100K
$1,742

MS

Mississippi

5.92% top marginal rate
Structure
Progressive
Burden @ $100K
$16,823

SC

South Carolina

6.10% top marginal rate
Structure
Progressive
Burden @ $100K
$5,396

Bridges Needing Most Attention in Idaho

Six lowest-condition bridges in Idaho, ranked by the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.

STC 6774;TETON HWY

Poor

Over: S.FK.TETON RIVER

0.5 N. TETON, Fremont, ID

Built 1977 Load: 0.9 t ADT: 1,200

SWAMP ROAD

Poor

Over: CAMAS CREEK

1.5 S. 0.3 E. HILL CITY, Camas, ID

Built 1965 Load: 1.8 t ADT: 40

ROAD 50343

Poor

Over: LOGAN CREEK

NO DATA ENTERED, Valley, ID

Built 1980 Load: 2.6 t ADT: 50

VADNAIS LANE

Poor

Over: CAMAS CREEK

1.9 S. 0.6 E. KILGORE, Clark, ID

Built 1981 Load: 2.7 t ADT: 50

2701: NORTH MILNER

Poor

Over: Milner Gooding Canal

5.0 mi N of Hunt Rd, Jerome, ID

Built 1960 Load: 4.2 t ADT: 25

MIDDLE FORK ROAD

Poor

Over: M.FK.WEISER RIVER

7.3 W 3.4 S DONNELLY, Adams, ID

Built 1957 Load: 4.5 t ADT: 70

All Bridges in Idaho

SHOOFLY CUTOFF

Fair

Over: LITTLE VALLEY CREEK

5.0 S. 6.1 W. BRUNEAU, Owyhee, ID

Built 1974 Load: 28.1 t ADT: 110

ELGIN ROAD

Fair

Over: FARMERS COOP CANAL

4.1S 4.4E NEW PLYMOUTH, Payette, ID

Built 1950 Load: 28.1 t ADT: 80

HALLING ROAD

Fair

Over: ROCK CREEK

2.0 N. 1.3 W. ROCKLAND, Power, ID

Built 1971 Load: 28.1 t ADT: 100

I 90B LOOP

Fair

Over: S.FK.COEUR D'ALENE RIVER

0.1 S. SILVERTON, Shoshone, ID

Built 1978 Load: 28.1 t ADT: 3,100

LITTLE N FORK RD

Fair

Over: CD'A RIVER;N.FK.CD'A R

3.5 N. 0.6 E. ENAVILLE, Shoshone, ID

Built 1968 Load: 28.1 t ADT: 30

E.FK.PINE CREEK RD

Fair

Over: E. FK. PINE CREEK

4.4 S. 0.5 E. PINEHURST, Shoshone, ID

Built 1986 Load: 28.1 t ADT: 140

OLD RIVER ROAD

Fair

Over: STEAMBOAT CREEK

7.1 N. 4.5 E ENAVILLE, Shoshone, ID

Built 1999 Load: 28.1 t ADT: 10

CEMETARY ROAD

Fair

Over: TETON CREEK

1.1 E DRIGGS, Teton, ID

Built 2004 Load: 28.1 t ADT: 1,500

TRAIL CREEK ROAD

Fair

Over: TRAIL CREEK

IN VICTOR, Teton, ID

Built 2009 Load: 28.1 t ADT: 10

3425 NORTH ROAD

Fair

Over: DRY CREEK

0.9 E. MURTAUGH, Twin Falls, ID

Built 1965 Load: 28.1 t ADT: 100

2500 NORTH ROAD

Fair

Over: SALMON LATERAL NO.1

0.5 N. 2.0 E. HOLLISTER, Twin Falls, ID

Built 1978 Load: 28.1 t ADT: 40

4000 NORTH RD

Fair

Over: LOW LINE CANAL

1.4 S. 5.4 W. BUHL, Twin Falls, ID

Built 1966 Load: 28.1 t ADT: 100

N 900 E

Fair

Over: LOW LINE CANAL

5.5 W. BUHL, Twin Falls, ID

Built 1990 Load: 28.1 t ADT: 100

BEAVER CREEK ROAD

Fair

Over: FLOAT CREEK

NO DATA ENTERED, Custer, ID

Built 1967 Load: 28.2 t ADT: 10

FS ROUTE NO. 3097

Fair

Over: COPPER CREEK

COPPER CREEK, Kootenai, ID

Built 1980 Load: 28.2 t ADT: 40

FS ROUTE NO. 1013

Fair

Over: CEDAR CREEK

CEDAR CREEK, Boundary, ID

Built 1964 Load: 28.5 t ADT: 50

CORRAL CANYON ROAD

Fair

Over: N. FK. BIG LOST RIVER

NO DATA ENTERED, Custer, ID

Built 1979 Load: 28.5 t ADT: 40

ROAD

Fair

Over: WYOMING CREEK

NO DATA ENTERED, Fremont, ID

Built 1975 Load: 28.5 t ADT: 10

20153

Fair

Over: WARM RIVER

NO DATA ENTERED, Fremont, ID

Built 1970 Load: 28.5 t ADT: 10

NFSR 50311

Fair

Over: ANDERSON CK

NO DATA ENTERED, Adams, ID

Built 1974 Load: 28.8 t ADT: 50

FDR

Fair

Over: WOOD RIVER

NEAR GALENA LODGE, Blaine, ID

Built 1967 Load: 28.8 t ADT: 70

FDR

Fair

Over: ALTURAS LAKE CREEK

ALTURAS LAKE OUTLET, Blaine, ID

Built 1964 Load: 28.8 t ADT: 100

81ST SO./COTTON RD

Fair

Over: BUTTE ARM CANAL

4.6 S. 1.6 W. IDAHO FALLS, Bonneville, ID

Built 1950 Load: 28.8 t ADT: 350

FDR 711

Fair

Over: QUARTZ CR NO 1

45 MILES FROM PIERCE ID, Clearwater, ID

Built 1967 Load: 28.8 t ADT: 5

MULE GULCH ROAD

Fair

Over: SMITH CREEK

5.5 NNW OF PRAIRIE, ID, Elmore, ID

Built 1981 Load: 28.8 t ADT: 5

NO DATA ENTERED

Fair

Over: FISHING CREEK

NO DATA ENTERED, Idaho, ID

Built 1954 Load: 28.8 t ADT: 30

N.SIDE WARM L. RD.

Fair

Over: WARM LAKE CREEK

WARM LAKE, IDAHO, Valley, ID

Built 1961 Load: 28.8 t ADT: 150

I 84 WBL

Fair

Over: INDIAN CREEK

15.9 E. BOISE ECL, Ada, ID

Built 1960 Load: 29.0 t ADT: 14,750

SMA7013;CLOVERDALE

Fair

Over: RIDENBAUGH CANAL

2.1 S. 2.8 E. MERIDIAN, Ada, ID

Built 1969 Load: 29.0 t ADT: 13,000

STC 1832;2000 S RD

Fair

Over: HIGH LINE CANAL

1.4 W 2.5 S ABERDEEN, Bingham, ID

Built 2010 Load: 29.0 t ADT: 310

US 95

Fair

Over: TRAIL CREEK

AT NAPLES, Boundary, ID

Built 1965 Load: 29.0 t ADT: 6,000

CO. RD.;OLD US 93

Fair

Over: 'M' CANAL

12.3 N. TWIN FALLS, Jerome, ID

Built 1934 Load: 29.0 t ADT: 5

I 90 EBL

Fair

Over: PEDESTRIAN/BIKE PATH

COEUR D'ALENE NWCL, Kootenai, ID

Built 1971 Load: 29.0 t ADT: 31,500

E. OAK AVENUE

Fair

Over: COW CREEK

IN GENESEE, Latah, ID

Built 2005 Load: 29.0 t ADT: 50

HIGHLINE ARROW RD

Fair

Over: POTLATCH R(ARROW JCT BR)

2.2 N. 2.3 E. SPALDING, Nez Perce, ID

Built 1920 Load: 29.0 t ADT: 90

US 30

Fair

Over: NOBLE CANAL

0.1 W. NEW PLYMOUTH, Payette, ID

Built 1956 Load: 29.0 t ADT: 4,600

I 90B

Fair

Over: PLACER CREEK

IN WALLACE, Shoshone, ID

Built 1942 Load: 29.0 t ADT: 2,700

1700 EAST RD

Fair

Over: HIGH LINE CANAL

5.7 S. 2.4 E. BUHL, Twin Falls, ID

Built 1981 Load: 29.0 t ADT: 400

LANDMARK/STANLEY

Fair

Over: ELK CREEK #2

7N 9E DEADWOOD RES, Valley, ID

Built 1961 Load: 29.0 t ADT: 30

US 95

Fair

Over: SPRING CREEK

AT CAMBRIDGE SWCL, Washington, ID

Built 1961 Load: 29.0 t ADT: 4,300

JOHNSON CK - 50038

Fair

Over: JOHNSON CR

NO DATA ENTERED, Adams, ID

Built 1964 Load: 29.2 t ADT: 50

FS ROUTE NO. 871

Fair

Over: E.F.CANUCK CR

EAST FORK CANUCK CREEK, Boundary, ID

Built 1990 Load: 29.2 t ADT: 50

CUSTER MOTORWAY

Fair

Over: YANKEE FORK

NO DATA ENTERED, Custer, ID

Built 1962 Load: 29.2 t ADT: 100

BEAVER-LOON ROAD

Fair

Over: W.FK. MAYFIELD CREEK

NO DATA ENTERED, Custer, ID

Built 1968 Load: 29.2 t ADT: 10

BEAVER-LOON ROAD

Fair

Over: W. FK. MAYFIELD CREEK

NO DATA ENTERED, Custer, ID

Built 1967 Load: 29.2 t ADT: 10

FDR

Fair

Over: SALMON RIVER

1 MILE WEST SVWC SNRA, Custer, ID

Built 1960 Load: 29.2 t ADT: 50

SMITH CREEK ROAD

Fair

Over: SMITH CREEK

3.4 MI. NE OF PRAIRIE, Elmore, ID

Built 1972 Load: 29.2 t ADT: 25

FDR 5119

Fair

Over: ELDORADO CREEK

SNOW CR BRIDGE, Idaho, ID

Built 1963 Load: 29.2 t ADT: 10

FDR 100

Fair

Over: ELDORADO CREEK

ELDORADO CREEK, Idaho, ID

Built 1987 Load: 29.2 t ADT: 150

GUARD STATION RD.

Fair

Over: SLATE CREEK

SLATE CREEK, Idaho, ID

Built 1965 Load: 29.2 t ADT: 50

Showing 651-700 of 1,742 bridges

Related

All states → | National rankings → | Understanding conditions → | Retired SD term explained →
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the FHWA National Bridge Inventory (NBI). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.

Understanding Bridge Conditions

How FHWA rates bridge condition on a 0-9 scale.

Check Your Daily Bridges

How to look up bridge condition data for bridges on your route.

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

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.