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

SMA7316;HOLMES AVE

Fair

Over: IDAHO CANAL

IN IDAHO FALLS, Bonneville, ID

Built 1999 Load: 20.9 t ADT: 12,500

W 17TH N

Fair

Over: OAKLAND CANAL

1.4 N. 4.8 W. IDAHO FALLS, Bonneville, ID

Built 1973 Load: 20.9 t ADT: 70

3350 WEST ROAD

Fair

Over: MOORE CANAL

1.4 N. MOORE, Butte, ID

Built 1979 Load: 20.9 t ADT: 200

STC 8423;LK LOWELL

Fair

Over: DEER FLAT NAMPA CANAL

1.3 S 2.8 W NAMPA, Canyon, ID

Built 1992 Load: 20.9 t ADT: 6,200

SMA 3723;ROBINSON

Fair

Over: MORA CANAL

8.2 S. 3.4 E. NAMPA, Canyon, ID

Built 1984 Load: 20.9 t ADT: 1,200

S3792;UPPR PLEASNT

Fair

Over: DEER FLAT LOW LINE CANAL

2.0 S. 4.8 E. WILDER, Canyon, ID

Built 1950 Load: 20.9 t ADT: 280

STC3762;GREENHURST

Fair

Over: NEW YORK CANAL

3.0S 4.0E NAMPA CITY CTR, Canyon, ID

Built 1972 Load: 20.9 t ADT: 2,800

STC3755;SOUTHSIDE

Fair

Over: MORA CANAL

8.9 S. 1.4 E. NAMPA, Canyon, ID

Built 1975 Load: 20.9 t ADT: 1,400

SMA8513;ID CNTR RD

Fair

Over: PHYLLIS CANAL

2.5 N. 2.4 E. NAMPA, Canyon, ID

Built 1987 Load: 20.9 t ADT: 25,000

PEEBLES LANE

Fair

Over: RIVERSIDE CANAL

3.0 S. 2.4 W. PARMA, Canyon, ID

Built 1977 Load: 20.9 t ADT: 250

DIP LANE

Fair

Over: FARMERS COOP CANAL

1.8 S. 5.2 E. PARMA, Canyon, ID

Built 1979 Load: 20.9 t ADT: 200

STC3738;SHELTON RD

Fair

Over: FARMERS COOP SEBREE CNL

0.6 N. 1.8 E. PARMA, Canyon, ID

Built 1975 Load: 20.9 t ADT: 580

HOLLOW ROAD

Fair

Over: 'C' LINE WEST CANAL

9.1 N. 0.4 E. CALDWELL, Canyon, ID

Built 1985 Load: 20.9 t ADT: 70

SMA8443;VICTORY RD

Fair

Over: RIDENBAUGH CANAL

4.0 E NAMPA, Canyon, ID

Built 1980 Load: 20.9 t ADT: 3,900

S. 9TH AVENUE

Fair

Over: INDIAN CREEK

IN CALDWELL;S.9TH AVE, Canyon, ID

Built 1968 Load: 20.9 t ADT: 750

CHUB FLAT RD.

Fair

Over: MEADOW CREEK

7.6 W. WAYAN, Caribou, ID

Built 1972 Load: 20.9 t ADT: 2

W 200 SOUTH ROAD

Fair

Over: 'J' CANAL

2.3 S. 3.1 W. BURLEY, Cassia, ID

Built 1977 Load: 20.9 t ADT: 340

1050 EAST ROAD

Fair

Over: 'H' CANAL

0.5N 2.0E DECLO;35S-1050E, Cassia, ID

Built 1974 Load: 20.9 t ADT: 100

400 SOUTH ROAD

Fair

Over: 'H' CANAL

3.2S 1.7W DECLO;670E-400S, Cassia, ID

Built 1975 Load: 20.9 t ADT: 160

550 EAST ROAD

Fair

Over: 'J' CANAL

5.8S 3.0W DECLO;655S-550E, Cassia, ID

Built 1973 Load: 20.9 t ADT: 100

E 100 S

Fair

Over: 'G' CANAL;E.BURLEY BR

1.4S 1.0E BURLEY;100E100S, Cassia, ID

Built 1976 Load: 20.9 t ADT: 1,400

1100 EAST ROAD

Fair

Over: 'J' CANAL;SE.DECLO BR

.3S 2.5E DECLO;110S-1100E, Cassia, ID

Built 1972 Load: 20.9 t ADT: 100

200 SOUTH ROAD

Fair

Over: 'G' CANAL

1.2 S. 3.1 W. DECLO, Cassia, ID

Built 1988 Load: 20.9 t ADT: 200

200 SOUTH ROAD

Fair

Over: 'G' CANAL

1.2 S. 3.2 W. DECLO, Cassia, ID

Built 1988 Load: 20.9 t ADT: 200

950 EAST ROAD

Fair

Over: MAIN SOUTH SIDE CANAL

2.8N 1.0E DECLO;195N-950E, Cassia, ID

Built 1992 Load: 20.9 t ADT: 100

STC7632;HILAND AVE

Fair

Over: 'G' CANAL

100 S 50 E;HILAND AVE, Cassia, ID

Built 1973 Load: 20.9 t ADT: 3,300

N 2000 E

Fair

Over: EGIN CANAL

IN PARKER, Fremont, ID

Built 1960 Load: 20.9 t ADT: 230

N 2000 E

Fair

Over: ST. ANTHONY CANAL

1.1 N. PARKER, Fremont, ID

Built 1966 Load: 20.9 t ADT: 90

E 400 N

Fair

Over: ST. ANTHONY CANAL

0.4 N. 2.1 W. EGIN, Fremont, ID

Built 1991 Load: 20.9 t ADT: 70

STC6807;BIG SPRGS

Fair

Over: HENRYS LAKE OUTLET

0.9 W. 2.4 E. MACKS INN, Fremont, ID

Built 1992 Load: 20.9 t ADT: 1,200

1900 EAST ROAD

Fair

Over: 'W' CANAL

0.8 N. 0.3 W. WENDELL, Gooding, ID

Built 1975 Load: 20.9 t ADT: 90

OLD MALAD RIVER RD

Fair

Over: MALAD RIVER GORGE

5.6 E. BLISS, Gooding, ID

Built 1947 Load: 20.9 t ADT: 80

E 300 N

Fair

Over: DRYBED CANAL;E.GROVER BR

5.6 E. RIGBY, Jefferson, ID

Built 1977 Load: 20.9 t ADT: 380

550 WEST ROAD

Fair

Over: LONG ISLAND CANAL

0.2 N. 0.9 W. LABELLE, Jefferson, ID

Built 1973 Load: 20.9 t ADT: 40

N 4100 E

Fair

Over: LEWISVILLE CANAL

1.0 N. 1.6 E. RIGBY, Jefferson, ID

Built 1969 Load: 20.9 t ADT: 1,600

MAIN DIVERSION RD

Fair

Over: CAMAS CREEK

1.3 MI. NE OF HDQTRS, Jefferson, ID

Built 1975 Load: 20.9 t ADT: 2

100 WEST ROAD

Fair

Over: 'N' CANAL

0.2 N. 1.0 W. JEROME, Jerome, ID

Built 2002 Load: 20.9 t ADT: 90

100 EAST ROAD

Fair

Over: 'U' CANAL

3.1 N. 1.0 E. JEROME, Jerome, ID

Built 1990 Load: 20.9 t ADT: 60

500 NORTH ROAD

Fair

Over: 'U' CANAL

5.0 N. 0.9 W. JEROME, Jerome, ID

Built 1969 Load: 20.9 t ADT: 200

200 NORTH ROAD

Fair

Over: 'S-2' CANAL

2.0 W. 2.0 N. JEROME, Jerome, ID

Built 2001 Load: 20.9 t ADT: 450

E. DUDLEY ROAD

Fair

Over: LATOUR CREEK;DUDLEY BR.

0.6 S. 1.7 W. CATALDO, Kootenai, ID

Built 1976 Load: 20.9 t ADT: 200

STC 6768; S2000W

Fair

Over: REID CANAL

1.3 E. 2.7 S. THORNTON, Madison, ID

Built 1960 Load: 20.9 t ADT: 2,000

W 6000 S

Fair

Over: TEXAS SLOUGH;NW.THORNTON

2.2 N. 2.5 W. THORNTON, Madison, ID

Built 1977 Load: 20.9 t ADT: 50

F STREET

Fair

Over: MAIN NORTHSIDE CANAL

AT ACEQUIA SCL;325N-365E, Minidoka, ID

Built 1960 Load: 20.9 t ADT: 250

200 NORTH ROAD

Fair

Over: MAIN NORTHSIDE CANAL

2.0 N. 3.2 E. RUPERT, Minidoka, ID

Built 1973 Load: 20.9 t ADT: 300

300 EAST ROAD

Fair

Over: 'A' CANAL

1.8 N. 3.0 E. RUPERT, Minidoka, ID

Built 1973 Load: 20.9 t ADT: 150

US 30 EBL SPUR

Fair

Over: SNAKE R;FRUITLAND BRIDGE

0.6 W. FRUITLAND, Payette, ID

Built 1967 Load: 20.9 t ADT: 27,000

ELGIN ROAD

Fair

Over: NOBLE CANAL

3.6S 4.4E NEW PLYMOUTH, Payette, ID

Built 1969 Load: 20.9 t ADT: 100

ROSS GULCH

Fair

Over: W.FK.PINE CREEK

4.0 S. 0.9 W. PINEHURST, Shoshone, ID

Built 1975 Load: 20.9 t ADT: 150

CDA RIVER ROAD

Fair

Over: SHOSHONE CREEK

6.4 N. PRICHARD, Shoshone, ID

Built 1960 Load: 20.9 t ADT: 30

Showing 351-400 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.