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

US 95

Fair

Over: KEITHLY CREEK

1.4 N. MIDVALE, Washington, ID

Built 1991 Load: 45.4 t ADT: 4,300

STC 7023;EDGEWOOD

Fair

Over: DRY CREEK CANAL

0.1N 1.2E Eagle, Ada, ID

Built 2015 Load: 46.0 t ADT: 2,400

SMA7406;PANCHERI

Fair

Over: EAST LATERAL CANAL

IN IDAHO FALLS, Bonneville, ID

Built 2014 Load: 46.0 t ADT: 4,200

SH 69

Fair

Over: TEN MILE CREEK

1.0 S. MERIDIAN, Ada, ID

Built 1963 Load: 46.3 t ADT: 47,000

OLD DOLLAR ROAD

Fair

Over: TRAIL CREEK

IN SUN VALLEY, Blaine, ID

Built 2004 Load: 46.3 t ADT: 1,000

SH 39 SBL

Fair

Over: SNAKE R.;AM.FALLS BR.

0.7 W. AMERICAN FALLS, Power, ID

Built 1975 Load: 46.3 t ADT: 1,350

NO DATA ENTERED

Fair

Over: COLD SPRINGS CREEK

40 MI FROM PIERCE ID, Clearwater, ID

Built 1949 Load: 46.7 t ADT: 100

FDR 1649

Fair

Over: BOULDER CREEK

WILDERNESS GATEWAY, Idaho, ID

Built 1968 Load: 46.7 t ADT: 30

FDR 250

Fair

Over: NF CLEARWATER RIVER

BUNGALOW BRIDGE, Clearwater, ID

Built 1958 Load: 47.0 t ADT: 100

FS ROUTE NO. 812

Fair

Over: TEPEE CREEK

AT TEPEE CR, Shoshone, ID

Built 1957 Load: 47.0 t ADT: 50

FDR

Fair

Over: SKELETON CREEK

ELMORE-CAMAS COUNTY LINE, Camas, ID

Built 1955 Load: 47.2 t ADT: 50

I 84

Fair

Over: 'C' CANAL

19.3 W. BURLEY, Jerome, ID

Built 1966 Load: 47.2 t ADT: 23,500

US 93

Fair

Over: LOW LINE CANAL

39.7 N. NEVADA LINE, Twin Falls, ID

Built 1994 Load: 47.2 t ADT: 6,900

NO DATA ENTERED

Fair

Over: NF CLEARWATER RIVER

WASHINGTON CREEK BRIDGE, Clearwater, ID

Built 1962 Load: 47.6 t ADT: 20

SMA 7674;MTN VIEW

Fair

Over: PARADISE CREEK

IN MOSCOW;6TH & MTN-VIEW, Latah, ID

Built 1993 Load: 48.1 t ADT: 7,100

DICKMAN ROAD

Fair

Over: WALDVOGEL CANAL

5.7 S. 4.3 W. KUNA, Ada, ID

Built 1950 Load: 48.6 t ADT: 200

FS ROUTE NO. 208

Fair

Over: CDA RIVER

15.4 MI. FROM BABINS JCT., Shoshone, ID

Built 1967 Load: 48.6 t ADT: 40

ROBINSON ROAD

Fair

Over: WALDVOGEL CANAL

4.4 S. 3.7 W. KUNA, Ada, ID

Built 1997 Load: 49.0 t ADT: 200

US 20B

Fair

Over: HENRY'S FK. SNAKE RIVER

IN ST ANTHONY, Fremont, ID

Built 1965 Load: 49.0 t ADT: 11,000

RINGBONE MINE RD.

Fair

Over: NAPIAS CREEK

NO DATA ENTERED, Lemhi, ID

Built 1994 Load: 49.6 t ADT: 50

US 26

Fair

Over: RIRIE OUTLET;WILLOW CRK

9.0 N. IDAHO FALLS, Bonneville, ID

Built 2010 Load: 49.9 t ADT: 8,900

SH 52

Fair

Over: LOWER PAYETTE CANAL

5.3 E. PAYETTE, Payette, ID

Built 1993 Load: 49.9 t ADT: 2,300

FS ROUTE 301

Fair

Over: ST MARIES RIVER

1 MILE FROM CLARKIA, ID, Shoshone, ID

Built 1973 Load: 49.9 t ADT: 50

M.FK.PAYETTE R. RD

Fair

Over: MIDDLE FORK PAYETTE

(HARDSCRABBLE BRIDGE), Valley, ID

Built 1965 Load: 50.2 t ADT: 90

150 EAST ROAD

Fair

Over: 'G' CANAL

2.0 S. 1.5 E. BURLEY, Cassia, ID

Built 2001 Load: 50.8 t ADT: 200

950 EAST ROAD

Fair

Over: 'J' CANAL

2.5S 1.0E DECLO;240S-950E, Cassia, ID

Built 2015 Load: 51.2 t ADT: 100

NO DATA ENTERED

Fair

Over: OROFINO CREEK

ROSEBUD BRIDGE, Clearwater, ID

Built 1952 Load: 51.2 t ADT: 20

FOREST ROAD 221

Fair

Over: ALLISON CREEK

NO DATA ENTERED, Idaho, ID

Built 1964 Load: 51.2 t ADT: 50

SMA7013;CLOVERDALE

Fair

Over: RIDENBAUGH CANAL

3.0 E. MERIDIAN, Ada, ID

Built 1992 Load: 51.7 t ADT: 19,000

LITTLE ROCK ROAD

Fair

Over: NOBLE CANAL

0.5 N. 2.2 W. LETHA, Gem, ID

Built 1960 Load: 51.7 t ADT: 50

2300 EAST ROAD

Fair

Over: N.GOODING MAIN CANAL

5.2 N. 4.0 E. GOODING, Gooding, ID

Built 1985 Load: 51.7 t ADT: 10

FS ROUTE NO. 208

Fair

Over: FLAT CREEK

17 MI. FROM BABINS JCT., Shoshone, ID

Built 1974 Load: 53.1 t ADT: 50

PHILLIPPI ST

Fair

Over: RIDENBAUGH CANAL

IN BOISE, Ada, ID

Built 1992 Load: 53.5 t ADT: 1,600

I 90

Fair

Over: BLUE CREEK BAY WEST GS

6.0E. 4.0S. COUER D'ALENE, Kootenai, ID

Built 1992 Load: 53.5 t ADT: 17,500

SMA 7603;BOISE AVE

Fair

Over: RIDENBAUGH CANAL

IN BOISE ON BOISE AVENUE, Ada, ID

Built 1988 Load: 54.4 t ADT: 5,800

E 800 N

Fair

Over: ENTERPRISE CANAL

0.1 N. 2.3 E. CHESTER, Fremont, ID

Built 1986 Load: 54.4 t ADT: 100

STC5711;ST JOE RVR

Fair

Over: MARBLE CREEK

10.8 E. CALDER, Shoshone, ID

Built 1974 Load: 55.3 t ADT: 320

FS ROUTE NO. 209

Fair

Over: N.F. CDA RIVER

AT HORSE HAVEN, Kootenai, ID

Built 1950 Load: 55.7 t ADT: 50

S. FLORIDA

Fair

Over: PHYLLIS CANAL

4.2 S. 1.2 E. CALDWELL, Canyon, ID

Built 2001 Load: 56.2 t ADT: 2,600

COW CREEK ROAD

Fair

Over: RUSH CREEK

4.7 N. 0.2 W. CAMBRIDGE, Washington, ID

Built 2004 Load: 56.2 t ADT: 50

US 95

Fair

Over: WILDLIFE UNDERPASS

15.6 S. EASTPORT, Boundary, ID

Built 2004 Load: 57.2 t ADT: 1,100

US 20B

Fair

Over: TWIN GROVES CANAL

1.6 N. ST ANTHONY, Fremont, ID

Built 1992 Load: 57.2 t ADT: 1,400

200 SOUTH ROAD

Fair

Over: 'L' CANAL

2.0 S. 3.5 E. JEROME, Jerome, ID

Built 2004 Load: 59.9 t ADT: 5,000

STC2721;2200 E. RD

Fair

Over: CEDAR DRAW

1.3 S. FILER;3765N-2200E, Twin Falls, ID

Built 1964 Load: 60.8 t ADT: 1,200

UPPERDALE ROAD

Fair

Over: HORNET CREEK

6.1 N. 7.1 W. COUNCIL, Adams, ID

Built 1960 Load: 61.7 t ADT: 30

1500 N WOODVILLE

Fair

Over: GREAT WESTERN CANAL

2.0 N 2.5 W SHELLEY, Bingham, ID

Built 2001 Load: 61.7 t ADT: 130

US 26

Fair

Over: S. GOODING MAIN CANAL

4.2 E. GOODING, Gooding, ID

Built 2008 Load: 62.6 t ADT: 1,900

CARR ROAD

Fair

Over: LITTLE SALMON RIVER

2.0 S. 1.2 W. NEW MEADOW, Adams, ID

Built 2000 Load: 66.2 t ADT: 10

ROUTE 468-A

Fair

Over: DEEP CR

NO DATA ENTERED, Idaho, ID

Built 1938 Load: 66.7 t ADT: 10

STC3895;YELLOWPINE

Fair

Over: JOHNSON CREEK

9 S. YELLOW PINE, Valley, ID

Built 1959 Load: 68.0 t ADT: 70

Showing 1,001-1,050 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.