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

DIAMOND ROAD

Unknown

Over: I 15 NB-SB;DIAMOND RD.GS

1.8 N. ROBERTS, Jefferson, ID

Built 1968 ADT: 5,800

E 1900 N

Unknown

Over: I 15 NB-SB;E 1900 N GS

1.8 S. HAMER, Jefferson, ID

Built 1960 ADT: 4,700

CAMAS CREEK ROAD

Unknown

Over: I 15 NB-SB;HAMER IC

AT HAMER, Jefferson, ID

Built 1960 ADT: 4,700

SH 25; RIDGEWAY RD

Unknown

Over: I 84;RIDGEWAY ROAD IC

14.5 W. BURLEY, Jerome, ID

Built 1966 ADT: 23,500

I 84 EBL

Unknown

Over: 400 SOUTH RD GS 2

4.9 E. JEROME, Jerome, ID

Built 1965 ADT: 1,000

I 84 WBL

Unknown

Over: 400 SOUTH RD GS 2

4.9 E. JEROME, Jerome, ID

Built 1965 ADT: 1,000

I 84 WBL

Unknown

Over: SH 25;KASOTA RD.IC

7.5 W. BURLEY, Jerome, ID

Built 1966 ADT: 1,600

N 300 W

Unknown

Over: I 84;EIRR;300 W GS

1.7 W. JEROME, Jerome, ID

Built 1971 ADT: 25,000

VINYARD ROAD

Unknown

Over: I 84;VINYARD RD GS

6.2 E. TWIN FALLS, Jerome, ID

Built 1965 ADT: 21,500

SH 58

Unknown

Over: US 95 IC

3.5 N. WORLEY, Kootenai, ID

Built 2008 ADT: 5,100

SMA7227;POINTEPKWY

Unknown

Over: I 90; POINTE PARKWAY IC

0.96 E. IDA-WA LINE, Kootenai, ID

Built 2012 ADT: 62,500

I 90 EBL

Unknown

Over: S 8505;PLEASANT VIEW IC

2.1 E. IDA-WA LINE, Kootenai, ID

Built 1976 ADT: 14,000

I 90 WBL

Unknown

Over: SH 41;SH 41 IC

1.7 E. POST FALLS, Kootenai, ID

Built 1971 ADT: 24,500

I 90 EBL

Unknown

Over: HUETTER ROAD GS

3.8 W. COEUR D'ALENE, Kootenai, ID

Built 1971 ADT: 6,100

I 90 EBL & WBL

Unknown

Over: STC7405; PENN AVE GS

COEUR D' ALENE ECL, Kootenai, ID

Built 2020 ADT: 1,400

I 90

Unknown

Over: POTLATCH HILL RD. GS

0.5 S. COEUR D'ALENE, Kootenai, ID

Built 1992 ADT: 150

I 90

Unknown

Over: TIMOTHY LN;EVERGREEN GS

4.0E. 4.0S. COEUR D'ALENE, Kootenai, ID

Built 1992 ADT: 10

MULLAN TRAIL RD

Unknown

Over: I90;MULLAN TRAIL RD IC

1.0 E. COEUR D'ALENE, Kootenai, ID

Built 1991 ADT: 17,500

I 90 WBL

Unknown

Over: LATOUR CREEK ROAD IC

10.1 W. KELLOGG, Kootenai, ID

Built 1964 ADT: 540

SMA7235;NW BLVD

Unknown

Over: I 90 EB-WB;NW BLVD IC

COEUR D ALENE WCL, Kootenai, ID

Built 2001 ADT: 63,000

US 95

Unknown

Over: I 90B;NW BLVD;US 95 IC

IN COEUR D'ALENE, Kootenai, ID

Built 1968 ADT: 23,500

CATALDO MISSION RD

Unknown

Over: I 90;CATALDO MISSION IC

11.2 W. KELLOGG, Kootenai, ID

Built 1964 ADT: 14,500

ALDER CREEK RD

Unknown

Over: I90;FOURTH OF JULY SM IC

15.7 E. COUER D'ALENE, Kootenai, ID

Built 1988 ADT: 14,500

US 95 NBL

Unknown

Over: UPRR;BITTER ROAD

6.0 N. WORLEY, Kootenai, ID

Built 2007 ADT: 100

US 95 SBL

Unknown

Over: UPRR;BITTER ROAD

6.0 N. WORLEY, Kootenai, ID

Built 2007 ADT: 100

US 95 SBL

Unknown

Over: LAKE CREEK;NESS ROAD

8.0 N. WORLEY, Kootenai, ID

Built 2007 ADT: 10

BUNCO ROAD

Unknown

Over: BUNCO RD; US 95 IC

1.6 S. ATHOL, Kootenai, ID

Built 2012 ADT: 1,000

US 95 SBL

Unknown

Over: US 95/SH 54 IC

IN ATHOL, Kootenai, ID

Built 2014 ADT: 5,600

GARWOOD RD

Unknown

Over: US 95; UPRR; OLD US 95

AT GARWOOD, Kootenai, ID

Built 2022 ADT: 10,000

STC5727;RAMSEY RD

Unknown

Over: BNSF RR; DIAGONAL RD

5.2 N. HAYDEN, Kootenai, ID

Built 2021 ADT: 2,000

US 20 EBL

Unknown

Over: STP 7726;S.REXBURG IC

1.5 S. REXBURG, Madison, ID

Built 1981 ADT: 16,000

US 20 WBL

Unknown

Over: STP 7726;S.REXBURG IC

1.5 S. REXBURG, Madison, ID

Built 1981 ADT: 16,000

US 20 EBL

Unknown

Over: SH 33;REXBURG IC

0.5 W. REXBURG;SH 33, Madison, ID

Built 1981 ADT: 19,500

US 20 WBL

Unknown

Over: THORTON IC

AT THORTON, Madison, ID

Built 2016 ADT: 2,700

I 84 EBL

Unknown

Over: SHODDE ROAD GS

5.4 W. BURLEY, Minidoka, ID

Built 1966 ADT: 30

I 84 WBL

Unknown

Over: I 84B;UPRR;HEYBURN IC

2.5 E. BURLEY, Minidoka, ID

Built 1961 ADT: 17,000

MERIDIAN ROAD

Unknown

Over: I 84;MERIDIAN RD GS

6.1 E. BURLEY, Minidoka, ID

Built 1961 ADT: 18,500

SMA7344;BRYDEN CYN

Unknown

Over: SNAKE R;HIGH/SOUTHWAY BR

IN LEWISTON;BRYDEN EXT, Nez Perce, ID

Built 1982 ADT: 13,500

SH 36

Unknown

Over: I 15;DEEP CR;SH 36 IC

3.9 N. MALAD, Oneida, ID

Built 1964 ADT: 11,500

I 84 WBL

Unknown

Over: JUNIPER ROAD IC

17.7 E. SUBLETT, Oneida, ID

Built 1968 ADT: 130

US 30 ;W. POKY IC

Unknown

Over: I 86;WEST POCATELLO IC

3.2 W. CHUBBUCK, Power, ID

Built 1968 ADT: 13,000

STC 1718;ARBON VLY

Unknown

Over: I 86;TRUCKERVILLE IC

8.8 W. CHUBBUCK, Power, ID

Built 1972 ADT: 13,000

RAINBOW ROAD

Unknown

Over: I 86 EB-WB;RAINBOW RD GS

10.6 E. AMERICAN FALLS, Power, ID

Built 1972 ADT: 12,500

I 90 WBL

Unknown

Over: PINEHURST ROAD GS

4.7 W. KELLOGG, Shoshone, ID

Built 2015 ADT: 1,600

I 90 EBL

Unknown

Over: STC 5766;JOHNSON ST.GS

IN OSBURN;JOHNSON STREET, Shoshone, ID

Built 1969 ADT: 1,700

I 90 WBL

Unknown

Over: STC 5766;JOHNSON ST.GS

IN OSBURN;JOHNSON STREET, Shoshone, ID

Built 1969 ADT: 1,700

I 90 EBL

Unknown

Over: I 90B;THIRD ST.IC

IN OSBURN;THIRD ST.IC, Shoshone, ID

Built 1969 ADT: 1,900

I 90 WBL

Unknown

Over: I 90B;THIRD ST.IC

IN OSBURN;THIRD ST.IC, Shoshone, ID

Built 1969 ADT: 1,900

I 90

Unknown

Over: STC 5766;SILVERTON IC

2.2 W. WALLACE, Shoshone, ID

Built 1978 ADT: 2,000

I 90 EB & WB

Unknown

Over: S.FK.CD'A R;FR.RD.

1.9 W. WALLACE, Shoshone, ID

Built 1978 ADT: 30

Showing 51-100 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.