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

I 90 EBL

Fair

Over: COEUR D'ALENE RIVER

10.3 W. KELLOGG, Kootenai, ID

Built 1964 Load: 37.2 t ADT: 7,250

W POIRER ROAD

Fair

Over: LAKE CREEK

6.3 N. 3.9 W. WORLEY, Kootenai, ID

Built 1950 Load: 37.2 t ADT: 10

US 20 WBL

Fair

Over: S.FK.TETON RIVER

0.9 N. REXBURG, Madison, ID

Built 1980 Load: 37.2 t ADT: 9,500

BRILL ROAD

Fair

Over: NOBLE CANAL

4.5S 5.2E NEW PLYMOUTH, Payette, ID

Built 1992 Load: 37.2 t ADT: 100

EAGLE CREEK ROAD

Fair

Over: E. FK. EAGLE CREEK

1.9 N. 1.7 W. MURRAY, Shoshone, ID

Built 1995 Load: 37.2 t ADT: 110

CLEAR CREEK ROAD

Fair

Over: CACHE CREEK

24 N. LOWMAN, Valley, ID

Built 1953 Load: 37.2 t ADT: 30

NFSR 50326

Fair

Over: LITTLE WEISER RIVER

NO DATA ENTERED, Adams, ID

Built 1970 Load: 37.3 t ADT: 50

3215: DYNAMITE CAV

Fair

Over: Milner Gooding Canal

9.6 mi E of US93, Lincoln, ID

Built 2014 Load: 37.3 t ADT: 25

FDR

Fair

Over: BIG SMOKY CREEK

BIG SMOKY JCT, Camas, ID

Built 1982 Load: 37.6 t ADT: 50

N.GOLD FK. LOOP RD

Fair

Over: NORTH GOLD FORK RIVER

8 MI NW OF WARM LAKE, Valley, ID

Built 1967 Load: 37.6 t ADT: 10

NO DATA ENTERED

Fair

Over: BEAR CREEK

NO DATA ENTERED, Adams, ID

Built 1970 Load: 37.9 t ADT: 50

NO DATA ENTERED

Fair

Over: LOST CR

NO DATA ENTERED, Adams, ID

Built 1957 Load: 37.9 t ADT: 50

S7286;JOHN ADAMS P

Fair

Over: IDAHO CANAL

IN IDAHO FALLS, Bonneville, ID

Built 2013 Load: 37.9 t ADT: 5,800

I 84

Fair

Over: TEN MILE CREEK

0.5 W. MERIDIAN, Ada, ID

Built 1965 Load: 38.1 t ADT: 125,500

US 95

Fair

Over: LITTLE SALMON RIVER

12.2 S. RIGGINS, Adams, ID

Built 1962 Load: 38.1 t ADT: 2,500

RAILROAD GRADE RD

Fair

Over: BOND CREEK

12.2 E. ST. MARIES, Benewah, ID

Built 1912 Load: 38.1 t ADT: 40

MTN VIEW RD; 1100E

Fair

Over: SAND CREEK

1.6 S. 2.2 E. SHELLEY, Bingham, ID

Built 1981 Load: 38.1 t ADT: 720

SH 75

Fair

Over: BIG WOOD RIVER

6.7 N. KETCHUM, Blaine, ID

Built 1991 Load: 38.1 t ADT: 2,300

STC 5804;WESTSIDE

Fair

Over: TROUT CREEK;N.BRANCH

4.8 S. 2.3 W. COPELAND, Boundary, ID

Built 1957 Load: 38.1 t ADT: 300

STC3717;FRIENDS RD

Fair

Over: DEER FLAT LOW LINE CANAL

1.9 S. 4.5 E. WILDER, Canyon, ID

Built 1961 Load: 38.1 t ADT: 480

I 90 WBL

Fair

Over: CD'A LAKE;BLUE CREEK BAY

7.7 E. COEUR D'ALENE, Kootenai, ID

Built 1951 Load: 38.1 t ADT: 8,750

CLEAR CREEK RD

Fair

Over: CLEAR CREEK

6.5 W 4.3 S CASCADE, Valley, ID

Built 1966 Load: 38.1 t ADT: 60

NO DATA ENTERED

Fair

Over: E FK LOST CREEK

NO DATA ENTERED, Adams, ID

Built 1978 Load: 38.2 t ADT: 50

LAKE CK ROAD 50104

Fair

Over: LAKE CREEK

NO DATA ENTERED, Idaho, ID

Built 1969 Load: 38.2 t ADT: 50

1250 EAST ROAD

Fair

Over: NORTHSIDE MAIN CANAL

12.5 E 2.6 S JEROME, Jerome, ID

Built 2013 Load: 38.2 t ADT: 10

FS ROUTE 752

Fair

Over: ST JOE RIVER

PROSPECTOR CR, Shoshone, ID

Built 1969 Load: 38.9 t ADT: 50

SH 55

Fair

Over: N. FK. PAYETTE RIVER

CASCADE SE CITY LIMITS, Valley, ID

Built 2013 Load: 38.9 t ADT: 7,500

US 91

Fair

Over: ROSS FORK CREEK

0.5 S. FORT HALL, Bingham, ID

Built 1925 Load: 39.0 t ADT: 4,000

BASELINE RD;1200 N

Fair

Over: GREAT WESTERN CANAL

1.0 S 3.2 W SHELLEY, Bingham, ID

Built 2001 Load: 39.0 t ADT: 190

STC 5804;WESTSIDE

Fair

Over: FISHER CREEK

1.5S. 2.9W. COPELAND, Boundary, ID

Built 2003 Load: 39.0 t ADT: 300

US 20

Fair

Over: KNOWLTON CREEK

3.4 E. FAIRFIELD, Camas, ID

Built 1958 Load: 39.0 t ADT: 1,800

NIPPER ROAD

Fair

Over: DOWNY MARSH VALLEY CNL

5.6 N. 3.1 W. BANCROFT, Caribou, ID

Built 1986 Load: 39.0 t ADT: 50

I 84 EBL

Fair

Over: MALAD R.GORGE;N.TUTTLE

5.6 E. BLISS, Gooding, ID

Built 1975 Load: 39.0 t ADT: 9,250

N YELLOWSTONE HWY

Fair

Over: DRY BED CANAL

1.7 N. 1.2 E. RIGBY, Jefferson, ID

Built 1999 Load: 39.0 t ADT: 3,400

I 90 EBL

Fair

Over: CD'A LAKE;BLUE CREEK BAY

7.7 E. COEUR D'ALENE, Kootenai, ID

Built 1972 Load: 39.0 t ADT: 8,750

CLEAR CREEK RD

Fair

Over: CLEAR CREEK

3.5 W 8.3 S CASCADE, Valley, ID

Built 1966 Load: 39.0 t ADT: 60

CLEAR CREEK RD

Fair

Over: CLEAR CREEK

4.3 W 7.7 S CASCADE, Valley, ID

Built 1966 Load: 39.0 t ADT: 60

FS ROUTE NO. 208

Fair

Over: BRETT CREEK

21.1 MI. FROM BAVINS JCT., Shoshone, ID

Built 1974 Load: 39.2 t ADT: 40

FDR 250

Fair

Over: LONG CREEK

CEDARS- 30 MI SW OF SUP, Clearwater, ID

Built 1948 Load: 39.5 t ADT: 50

FOREST ROAD 651

Fair

Over: O'HARA CREEK

NO DATA ENTERED, Idaho, ID

Built 1958 Load: 39.5 t ADT: 50

PEBBLE CREEK ROAD

Fair

Over: PORTNEUF R;PEBBLE BR

1.6 N. 5.5 W. BANCROFT, Caribou, ID

Built 1984 Load: 39.6 t ADT: 115

I 86 EBL

Fair

Over: UPRR;CHUBBUCK OVERPASS

0.4 E. CHUBBUCK, Bannock, ID

Built 1963 Load: 39.9 t ADT: 12,750

FS ROUTE NO. 281

Fair

Over: SMITH CREEK

SMITH CREEK, Boundary, ID

Built 1974 Load: 39.9 t ADT: 50

US 93

Fair

Over: BIG LOST RIVER

0.9 S. MOORE, Butte, ID

Built 1962 Load: 39.9 t ADT: 2,400

FDR 705

Fair

Over: ISABELLA CREEK

39 MILES FROM PIERCE ID, Clearwater, ID

Built 1969 Load: 39.9 t ADT: 20

SH 48

Fair

Over: BURGESS CANAL

6.4 E. RIGBY, Jefferson, ID

Built 1986 Load: 39.9 t ADT: 2,000

FS ROUTE N0. 812

Fair

Over: LEIBERG CREEK

AT HEMLOCK CREEK, Kootenai, ID

Built 1959 Load: 39.9 t ADT: 50

US 95

Fair

Over: LAPWAI CREEK

1 N. LAPWAI, Nez Perce, ID

Built 1964 Load: 39.9 t ADT: 6,800

NFSR 50446

Fair

Over: FISHER CREEK

NO DATA ENTERED, Valley, ID

Built 1965 Load: 39.9 t ADT: 50

US 95

Fair

Over: MANNS CREEK

10.0 N. WEISER NCL, Washington, ID

Built 2004 Load: 39.9 t ADT: 4,300

Showing 901-950 of 1,742 bridges

Related

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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.