State profile · Below national median SD

Idaho bridge safety

Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in Idaho — drawn straight from the FHWA National Bridge Inventory.

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

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 rated 0-4

Structurally Deficient

5.5%

96 bridges flagged for repair priority

-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 — Structurally deficient share 18.4%
National avg

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

Condition Distribution

Bridge inventory deck-condition mix — Idaho (FHWA NBI)

Idaho33.295063145809415%55.166475315729045%GoodFairPoorStructurally Deficient
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 on the structurally deficient leaderboard (lower share = better)

States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below Idaho on the same metric.

20

Kansas

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

56

Wyoming

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

16

Idaho

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

28

Mississippi

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

45

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 composite NBI rating. Each is inspected at least every 24 months.

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

Structurally Deficient

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

SH 77

Fair

Over: CANAL

6.4 N. ALBION, Cassia, ID

Built 1985 Load: 32.7 t ADT: 1,800

NO DATA ENTERED

Fair

Over: LITTLE MOOSE CREEK

1.0 MI N OF OLD KELLY CR, Clearwater, ID

Built 1954 Load: 32.7 t ADT: 40

STC 3811;PINE RD

Fair

Over: LIME CREEK

4.6 S. 1.8 E. PINE, Elmore, ID

Built 1984 Load: 32.7 t ADT: 580

US 20 EBL & WBL

Fair

Over: SALEM UNION CANAL

1.2 E. ST ANTHONY, Fremont, ID

Built 1979 Load: 32.7 t ADT: 9,000

2400 EAST ROAD

Fair

Over: GOODING MAIN CANAL

0.7 S. 5.0 E. GOODING, Gooding, ID

Built 1933 Load: 32.7 t ADT: 20

SH 48

Fair

Over: MARKET LAKE CANAL

IN ROBERTS, Jefferson, ID

Built 1968 Load: 32.7 t ADT: 2,800

STC 6715(N 3400 E)

Fair

Over: DRY BED CANAL

0.3 S. MENAN, Jefferson, ID

Built 1957 Load: 32.7 t ADT: 1,100

OLD HWY 20

Fair

Over: PARKS LEWISVILLE CANAL

1.2 N. 0.8 E. RIGBY, Jefferson, ID

Built 1939 Load: 32.7 t ADT: 3,400

US 95

Fair

Over: BLACKWELL SLOUGH

1.3 S. COEUR D'ALENE, Kootenai, ID

Built 1969 Load: 32.7 t ADT: 13,500

STC 4805;CEDAR RDG

Fair

Over: POTLATCH RIVER

1.6 N. 4.1 E. KENDRICK, Latah, ID

Built 1992 Load: 32.7 t ADT: 310

FS ROUTE NO. 1514

Fair

Over: TEPEE CREEK

TEPEE CR, Shoshone, ID

Built 1974 Load: 32.7 t ADT: 50

N. 3300 EAST RD.

Fair

Over: PERRINE COULEE

3.5 S. 3.3 E. TWIN FALLS, Twin Falls, ID

Built 1979 Load: 32.7 t ADT: 760

DEER CREEK ROAD

Fair

Over: BEAR VALLEY CREEK

21 N. LOWMAN, Valley, ID

Built 1971 Load: 32.7 t ADT: 30

FS ROUTE NO. 422

Fair

Over: BIG ELK CREEK

BIG ELK CREEK, Shoshone, ID

Built 1955 Load: 33.0 t ADT: 50

500N-1130E

Fair

Over: MAIN SOUTHSIDE CANAL

6.0 N. 2.9 E. DECLO, Cassia, ID

Built 1981 Load: 33.3 t ADT: 100

N. CRANE ROAD

Fair

Over: CRANE CREEK

6.0 S. 14.7 E. MIDVALE, Washington, ID

Built 1982 Load: 33.3 t ADT: 50

COLUMBIA ROAD

Fair

Over: MASON CREEK FEEDER CANAL

2.8 N. 0.8 E. KUNA, Ada, ID

Built 1989 Load: 33.6 t ADT: 5,100

FOUNDRY RD;E 1100N

Fair

Over: RESERVATION CANAL

2.0 S. 1.9 W. SHELLEY, Bingham, ID

Built 1987 Load: 33.6 t ADT: 10

US 20

Fair

Over: CHIMNEY CR.;SHEEP CR.

8.4 W. FAIRFIELD, Camas, ID

Built 1961 Load: 33.6 t ADT: 1,800

US 20

Fair

Over: CORRAL CREEK

6.8 W. FAIRFIELD, Camas, ID

Built 1969 Load: 33.6 t ADT: 1,800

BROADMORE WAY

Fair

Over: INDIAN CREEK

IN NAMPA, Canyon, ID

Built 1948 Load: 33.6 t ADT: 20

STC3814;OLD HWY 30

Fair

Over: CLOVER CREEK;KING HILL

1.5 E. KING HILL, Elmore, ID

Built 1970 Load: 33.6 t ADT: 150

US 93

Fair

Over: 'U' CANAL

12.5 N. TWIN FALLS, Jerome, ID

Built 1984 Load: 33.6 t ADT: 6,500

US 93

Fair

Over: N.FK.SALMON RIVER

IN NORTH FORK, Lemhi, ID

Built 1955 Load: 33.6 t ADT: 1,100

US 93

Fair

Over: N.FK.SALMON RIVER

1.0 N. NORTH FORK, Lemhi, ID

Built 1955 Load: 33.6 t ADT: 730

I 90 WBL

Fair

Over: S.FK.COEUR D'ALENE RIVER

OSBURN WCL, Shoshone, ID

Built 1969 Load: 33.6 t ADT: 6,250

4300 EAST ROAD

Fair

Over: TWIN FALLS MAIN CANAL

2.9 N. 2.4 W. MURTAUGH, Twin Falls, ID

Built 1997 Load: 33.6 t ADT: 30

RIVER ROAD

Fair

Over: CEDAR DRAW CREEK

5.9 N. 3.0 W. FILER, Twin Falls, ID

Built 1999 Load: 33.6 t ADT: 240

FS ROUTE NO. 211

Fair

Over: MEADOW CREEK

MEADOW CREEK, Boundary, ID

Built 1961 Load: 33.7 t ADT: 50

NO DATA ENTERED

Fair

Over: DONKEY CREEK

DONKEY CREEK, Shoshone, ID

Built 1952 Load: 33.7 t ADT: 40

TYNDALL CREEK ROAD

Fair

Over: SOUTH FORK SALMON RIVER

1 MI N OF STOLLE MEADOWS, Valley, ID

Built 1966 Load: 33.7 t ADT: 25

FOREST ROAD 651

Fair

Over: O'HARA CREEK

NO DATA ENTERED, Idaho, ID

Built 1958 Load: 34.0 t ADT: 50

FS ROUTE NO. 321

Fair

Over: DAVEGGIO CREEK

DAVEGGIO CREEK, Shoshone, ID

Built 1952 Load: 34.0 t ADT: 50

STC 3894;HORNET CR

Fair

Over: NORTH HORNET CREEK

5.5 N. 5.6 W. COUNCIL, Adams, ID

Built 1962 Load: 34.5 t ADT: 190

US 30

Fair

Over: THOMAS FORK CREEK

1.2 W. IDA-WYO LINE, Bear Lake, ID

Built 1964 Load: 34.5 t ADT: 1,200

SH 200

Fair

Over: STRONG CREEK;E.HOPE BR.

IN EAST HOPE, Bonner, ID

Built 1975 Load: 34.5 t ADT: 2,900

EAST SHORE RD

Fair

Over: TWO MOUTH CREEK

19.0 N. COOLIN, Bonner, ID

Built 1970 Load: 34.5 t ADT: 110

STC 6703; E 65TH S

Fair

Over: E.FK. SAND CREEK

2.0 S. 2.6 E. IDAHO FALLS, Bonneville, ID

Built 1978 Load: 34.5 t ADT: 3,200

I 84 WBL

Fair

Over: SQUAW CREEK

14.2 W. MOUNTAIN HOME, Elmore, ID

Built 1960 Load: 34.5 t ADT: 14,000

I 84 WBL

Fair

Over: MALAD R.GORGE;N.TUTTLE

5.6 E. BLISS, Gooding, ID

Built 1975 Load: 34.5 t ADT: 9,250

US 95 NBL

Fair

Over: COW CREEK

15.2 N. LEWISTON, Nez Perce, ID

Built 2007 Load: 34.5 t ADT: 3,000

CLEAR CREEK RD

Fair

Over: CLEAR CREEK

3.7 W 8.2 S CASCADE, Valley, ID

Built 1966 Load: 34.5 t ADT: 60

NO DATA ENTERED

Fair

Over: LICK CREEK

NO DATA ENTERED, Adams, ID

Built 1973 Load: 34.7 t ADT: 50

NO DATA ENTERED

Fair

Over: WARREN CR

NO DATA ENTERED, Idaho, ID

Built 1969 Load: 34.7 t ADT: 50

3212: SOUTH PAGARI

Fair

Over: Little Wood River

0.3 mi SE of US26, Lincoln, ID

Built 1940 Load: 34.7 t ADT: 25

US 95

Fair

Over: LAPWAI CREEK

2.4 S. CULDESAC, Nez Perce, ID

Built 2012 Load: 34.7 t ADT: 3,500

FDR 5301

Fair

Over: WASHINGTON CREEK

23 MILES FROM PIERCE ID, Clearwater, ID

Built 1961 Load: 35.0 t ADT: 20

FS ROUTE 301

Fair

Over: FISHHOOK CREEK

5.3 MI F/ AVERY, ID, Shoshone, ID

Built 1966 Load: 35.0 t ADT: 40

FDR

Fair

Over: PETTIT LAKE CREEK

PETTIT LAKE, Custer, ID

Built 1982 Load: 35.3 t ADT: 50

NO DATA ENTERED

Fair

Over: BLACKBIRD CREEK

NO DATA ENTERED, Lemhi, ID

Built 1999 Load: 35.3 t ADT: 50

Showing 801-850 of 1,742 bridges

Related

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

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). A "structurally deficient" rating is a repair-priority signal, not a closure or unsafe-to-cross designation. Consult a qualified civil engineer before making decisions based on this data.

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.