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

E 100 N RD

Fair

Over: BURGESS CANAL

3.0 S. 0.2 W. LEWISVILLE, Jefferson, ID

Built 1970 Load: 19.8 t ADT: 310

FDR 60103

Fair

Over: PANTHER CREEK

6 MILES SW OF COBALT, Lemhi, ID

Built 1960 Load: 19.8 t ADT: 50

FS ROUTE NO. 1997

Fair

Over: RYE CREEK

8.9 MILES TO AVERY, Shoshone, ID

Built 1949 Load: 19.8 t ADT: 50

NFSR 50432

Fair

Over: N FK PAYETTE

NO DATA ENTERED, Valley, ID

Built 1961 Load: 19.8 t ADT: 50

RAPID LIGHTNING RD

Fair

Over: RAPID LIGHTNING CREEK

3.4 S. 5.4 E. SAMUELS, Bonner, ID

Built 1970 Load: 20.0 t ADT: 270

N 4950 E

Fair

Over: FARMERS FRIEND CANAL

0.4 N. 3.1 E. RIRIE, Jefferson, ID

Built 1950 Load: 20.0 t ADT: 550

STC2757;NORTH ROAD

Fair

Over: 'U' CANAL

3.0 N. JEROME, Jerome, ID

Built 1954 Load: 20.0 t ADT: 1,500

ARCHIE CK. ROAD

Fair

Over: SOUTH FORK PAYETTE RIVER

5 MI EAST OF LOWMAN IDAHO, Boise, ID

Built 1962 Load: 20.1 t ADT: 40

SAWMILL CANYON RD

Fair

Over: LITTLE LOST RIVER

40.5 MI. NNW OF HOWE ID, Custer, ID

Built 1957 Load: 20.1 t ADT: 40

QUEENS RIVER ROAD

Fair

Over: QUEENS RIVER

3.5 MI NW OF ATLANTA, ID, Elmore, ID

Built 1965 Load: 20.1 t ADT: 15

FS ROUTE 2354

Fair

Over: BIG CREEK

3.5 MI FROM BIG CREEK, ID, Shoshone, ID

Built 1936 Load: 20.1 t ADT: 50

FS ROUTE NO. 412

Fair

Over: CDA RIVER

23.4 MI FROM SHOSHONE W.C, Shoshone, ID

Built 1935 Load: 20.1 t ADT: 50

FS ROUTE NO. 208

Fair

Over: CDA RIVER

22.8 MI. FROM BABINS JCT., Shoshone, ID

Built 1974 Load: 20.1 t ADT: 50

FS ROUTE NO. 715

Fair

Over: ST JOE RIVER

ST. JOE RIVER, Shoshone, ID

Built 1953 Load: 20.1 t ADT: 50

FDR 250

Fair

Over: LAKE CREEK

JCT LAKE CR / NF CLW RIV, Clearwater, ID

Built 1954 Load: 20.4 t ADT: 80

NO DATA ENTERED

Fair

Over: NORTH FORK SALMON

NO DATA ENTERED, Lemhi, ID

Built 1956 Load: 20.4 t ADT: 50

NO DATA ENTERED

Fair

Over: OWL CREEK

NO DATA ENTERED, Lemhi, ID

Built 1959 Load: 20.4 t ADT: 200

FS ROUTE NO. 412

Fair

Over: JORDAN CREEK

JORDAN CREEK, Shoshone, ID

Built 1957 Load: 20.4 t ADT: 50

BEAVER CREEK ROAD

Fair

Over: SEAFOAM CREEK

NO DATA ENTERED, Custer, ID

Built 1968 Load: 20.7 t ADT: 10

ROAD

Fair

Over: BEAR VALLEY CREEK

NO DATA ENTERED, Lemhi, ID

Built 1960 Load: 20.7 t ADT: 50

FS ROUTE 1205

Fair

Over: ST JOE RIVER

RED IVES WORKCENTER, Shoshone, ID

Built 1935 Load: 20.7 t ADT: 50

SMA 7563;OVERLAND

Fair

Over: TEN MILE CREEK

1.0 S. 0.1 E. MERIDIAN, Ada, ID

Built 1986 Load: 20.9 t ADT: 24,000

ASPEN COVE

Fair

Over: RIDENBAUGH CANAL

1.9 S. 1.2 W. MERIDIAN, Ada, ID

Built 1974 Load: 20.9 t ADT: 390

STC 9203;BARRISTER

Fair

Over: RIDENBAUGH CANAL

IN BOISE;BARRISTER DR., Ada, ID

Built 1978 Load: 20.9 t ADT: 6,200

WALTMAN LANE

Fair

Over: TEN MILE CREEK

0.9 S. 0.4 W. MERIDIAN, Ada, ID

Built 1965 Load: 20.9 t ADT: 80

S3760;FLTG FEATHER

Fair

Over: MIDDLETON CANAL

1.0 N. STAR, Ada, ID

Built 1994 Load: 20.9 t ADT: 4,800

STC 7483;MCDERMOTT

Fair

Over: RIDENBAUGH CANAL

1.8 S. 4.1 W. MERIDIAN, Ada, ID

Built 1969 Load: 20.9 t ADT: 590

STC 1847; E 1250 N

Fair

Over: SNAKE RIVER;W.SHELLEY BR

2.1 W. SHELLEY, Bingham, ID

Built 1965 Load: 20.9 t ADT: 3,200

STC 1879;LONG VLY

Fair

Over: WILLOW CREEK

3.8 S. 22.0 E. FIRTH, Bingham, ID

Built 1999 Load: 20.9 t ADT: 80

PRESTO ROAD

Fair

Over: SAND CREEK

0.2 S. 2.3 E. KIMBALL, Bingham, ID

Built 1930 Load: 20.9 t ADT: 140

BASELINE ROAD

Fair

Over: LITTLE SAND CREEK

1.0 S. 1.7 E. SHELLEY, Bingham, ID

Built 1961 Load: 20.9 t ADT: 1,300

1000 SOUTH ROAD

Fair

Over: LOW LINE CANAL

1.5 W. 1.0 N STERLING, Bingham, ID

Built 1972 Load: 20.9 t ADT: 150

CANYON ROAD

Fair

Over: SNAKE RIVER VALLEY CANAL

2.0 N. 0.9 E. SHELLEY, Bingham, ID

Built 1978 Load: 20.9 t ADT: 470

1300 SOUTH ROAD

Fair

Over: LOW LINE CANAL

3.9 W. 2.0 S. STERLING, Bingham, ID

Built 1970 Load: 20.9 t ADT: 100

JOHNSON RD; 200 W

Fair

Over: PEOPLES CANAL

2.9 N. 1.9 E. GROVELAND, Bingham, ID

Built 1967 Load: 20.9 t ADT: 140

W 1500 S; VANDERFO

Fair

Over: HIGH LINE CANAL

2.5N. 2.0W.ABERDEEN;1500S, Bingham, ID

Built 1964 Load: 20.9 t ADT: 200

JOHNSON ROAD

Fair

Over: ABERDEEN SPRINGFIELD CNL

2.8 N. 1.9 E. GROVELAND, Bingham, ID

Built 1975 Load: 20.9 t ADT: 150

HIGHLINE ROAD

Fair

Over: SAND CREEK

0.5 S. 2.3 E. FIRTH, Bingham, ID

Built 1968 Load: 20.9 t ADT: 200

WASHINGTON ROAD

Fair

Over: PEOPLES CANAL

2.5 N. 0.9 E. GROVELAND, Bingham, ID

Built 1968 Load: 20.9 t ADT: 200

BUTTE ROUND

Fair

Over: LOW LINE CANAL

2.8N. 1.5E.ABERDEEN;2600W, Bingham, ID

Built 1935 Load: 20.9 t ADT: 100

STC1837;W RIVER RD

Fair

Over: ABERDEEN SPRINGFIELD CNL

5.6 N. 2.3 E. BLACKFOOT, Bingham, ID

Built 1981 Load: 20.9 t ADT: 1,300

SLOUGH ROAD

Fair

Over: DESERT DRAIN

1.0 N. ABERDEEN, Bingham, ID

Built 1977 Load: 20.9 t ADT: 200

WILSON ROAD

Fair

Over: WATSON SLOUGH CANAL

1.6 S. 2.0 W. RIVERSIDE, Bingham, ID

Built 1968 Load: 20.9 t ADT: 235

CHRISTENSEN; 150 E

Fair

Over: PEOPLES CANAL

6.3 N. 3.5 E. BLACKFOOT, Bingham, ID

Built 1973 Load: 20.9 t ADT: 140

MTN VIEW RD;1100 E

Fair

Over: IDAHO CANAL

0.3 S. GOSHEN, Bingham, ID

Built 1968 Load: 20.9 t ADT: 300

DESERT RD; W 1800S

Fair

Over: HIGH LINE CANAL

0.5 S. 2.0 W. ABERDEEN, Bingham, ID

Built 1962 Load: 20.9 t ADT: 200

HULEN MEADOWS ROAD

Fair

Over: BIG WOOD RIVER

2.7 N. 0.7 W. KETCHUM, Blaine, ID

Built 1975 Load: 20.9 t ADT: 100

RIVERVIEW STREET

Fair

Over: BELLEVUE CANAL

IN BELLEVUE, Blaine, ID

Built 1980 Load: 20.9 t ADT: 40

CARIBOU CK;NF-2684

Fair

Over: CARIBOU CREEK

3.0 W. 3.0 N. SAMUELS, Bonner, ID

Built 1985 Load: 20.9 t ADT: 100

STC 6703;E 65TH S

Fair

Over: IDAHO CANAL

3.6 S. 1.2 E. IDAHO FALLS, Bonneville, ID

Built 1950 Load: 20.9 t ADT: 3,800

Showing 301-350 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.