Total Bridges
1,742
Public highway bridges in Idaho
State profile · Below median Poor share
Idaho bridge safety
Condition ratings, load ratings, and Poor-condition data for every public highway bridge in Idaho, based on the FHWA National Bridge Inventory.
- 1,742
- Public bridges
- 33.3%
- Good condition
- 5.5%
- Poor condition
Data updated May 2026
Good Condition
33.3%
580 bridges rated 7-9
-16.7pp vs 50% benchmark
Poor Condition
5.5%
96 bridges whose lowest applicable component is rated 0-4
-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 - Poor-condition share 18.4%
National avg
Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.
Condition Distribution
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 by Poor-condition share (lower share = better)
States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below Idaho on the same metric.
KS
Kansas
5.25% top marginal rate
WY
Wyoming
5.41% top marginal rate
ID
Idaho
5.51% top marginal rate
MS
Mississippi
5.92% top marginal rate
SC
South Carolina
6.10% top marginal rate
Bridges Needing Most Attention in Idaho
Six lowest-condition bridges in Idaho, ranked by the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.
STC 6774;TETON HWY
PoorOver: S.FK.TETON RIVER
0.5 N. TETON, Fremont, ID
Built 1977 Load: 0.9 t ADT: 1,200
SWAMP ROAD
PoorOver: CAMAS CREEK
1.5 S. 0.3 E. HILL CITY, Camas, ID
Built 1965 Load: 1.8 t ADT: 40
ROAD 50343
PoorOver: LOGAN CREEK
NO DATA ENTERED, Valley, ID
Built 1980 Load: 2.6 t ADT: 50
VADNAIS LANE
PoorOver: CAMAS CREEK
1.9 S. 0.6 E. KILGORE, Clark, ID
Built 1981 Load: 2.7 t ADT: 50
2701: NORTH MILNER
PoorOver: Milner Gooding Canal
5.0 mi N of Hunt Rd, Jerome, ID
Built 1960 Load: 4.2 t ADT: 25
MIDDLE FORK ROAD
PoorOver: 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
FDR
PoorOver: VALLEY CREEK
6 MILES NW OF STANLEY, Custer, ID
Built 1950 Load: 24.0 t ADT: 50
MOCCASIN-NAPIAS RD
PoorOver: NAPIAS CREEK
NO DATA ENTERED, Lemhi, ID
Built 1953 Load: 24.3 t ADT: 25
OLD HWY 91
PoorOver: UPRR;N.SPENCER RR OP
13.1 N. 5.2 W. SPENCER, Clark, ID
Built 1936 Load: 24.5 t ADT: 50
SQUAW CREEK RD
PoorOver: SQUAW CREEK
2.9 W. CLAYTON, Custer, ID
Built 1960 Load: 25.2 t ADT: 100
NO DATA ENTERED
PoorOver: OROFINO CREEK
MILL POND, Clearwater, ID
Built 1958 Load: 25.3 t ADT: 140
STC7151;BENTON ST
PoorOver: PORTNEUF RIVER
IN POCATELLO;BENTON ST, Bannock, ID
Built 1969 Load: 25.4 t ADT: 2,800
FOREST ROAD 1614
PoorOver: FRENCH CREEK
18 MI. FROM RIGGINS, ID, Idaho, ID
Built 1957 Load: 27.9 t ADT: 50
US 20 FRONTAGE RD
PoorOver: FALL RIVER OVERFLOW
1.5 N. 3.7 E. ST ANTHONY, Fremont, ID
Built 1932 Load: 28.1 t ADT: 10
FS ROUTE NO. 2706
PoorOver: GRANITE CREEK
GRANITE CREEK, Bonner, ID
Built 1964 Load: 28.2 t ADT: 50
FS ROUTE NO. 308
PoorOver: KALISPELL CREEK
KALISPELL CREEK, Bonner, ID
Built 1955 Load: 28.8 t ADT: 50
PARKINSON ROAD
PoorOver: CUB RIVER
IN FRANKLIN;PARKINSON RD., Franklin, ID
Built 1926 Load: 29.0 t ADT: 310
I 90 WBL
PoorOver: PEDESTRIAN/BIKE PATH
COEUR D'ALENE NWCL, Kootenai, ID
Built 1971 Load: 29.0 t ADT: 31,500
PR
PoorOver: NORTH FORK WOOD RIVER
2 MILES NORTH SNRA HQDS, Blaine, ID
Built 1950 Load: 29.2 t ADT: 50
NO DATA ENTERED
PoorOver: YELLOWJACKET CREEK
NO DATA ENTERED, Lemhi, ID
Built 1962 Load: 29.8 t ADT: 50
NORTH APPLE STREET
PoorOver: LITTLE WOOD RIVER
IN SHOSHONE;N.APPLE ST, Lincoln, ID
Built 1920 Load: 29.9 t ADT: 200
FS ROUTE NO. 427
PoorOver: BOULDER CR CALLAHAN
BOULDER CREEK, Boundary, ID
Built 1961 Load: 30.5 t ADT: 50
2416: TEAKETTLE RO
PoorOver: Y-1 Canal
2.4 mi N of ID26, Gooding, ID
Built 1991 Load: 30.5 t ADT: 25
FDR 103
PoorOver: YOOSA CREEK
YOOSA CREEK BRIDGE, Idaho, ID
Built 1963 Load: 30.5 t ADT: 40
RUBY CREEK RD
PoorOver: RUBY CREEK(#4)
3.3 N. 0.8 W. NAPLES, Boundary, ID
Built 1970 Load: 30.8 t ADT: 30
FDR 500
PoorOver: ELDORADO CREEK
32 MILES FROM KAMIAH, ID, Idaho, ID
Built 1967 Load: 31.1 t ADT: 99
RD 360
PoorOver: SAVAGE CREEK
10 MI FROM POWELL RS, Idaho, ID
Built 2006 Load: 31.8 t ADT: 10
FS ROUTE NO. 1221
PoorOver: GOLD CREEK
GOLD CREEK, Shoshone, ID
Built 1963 Load: 32.4 t ADT: 50
NO DATA ENTERED
PoorOver: BOULDER CREEK
NO DATA ENTERED, Adams, ID
Built 1957 Load: 32.7 t ADT: 50
FS ROUTE NO. 1009
PoorOver: GRASS CREEK
GRASS CR, Boundary, ID
Built 1972 Load: 32.7 t ADT: 50
BEAVER-LOON ROAD
PoorOver: JORDAN CREEK
NO DATA ENTERED, Custer, ID
Built 1993 Load: 32.7 t ADT: 100
EAST FORK RD
PoorOver: ROAD CREEK
5.8 S 5.6 E CLAYTON, Custer, ID
Built 2022 Load: 33.0 t ADT: 90
FDR 520
PoorOver: YOOSA CREEK
27 MILES FROM PIERCE, Idaho, ID
Built 1963 Load: 34.0 t ADT: 40
FS ROUTE NO. 2361
PoorOver: BEAVER CREEK
JCT W/SHOSHONE CO. RD.456, Shoshone, ID
Built 1983 Load: 34.3 t ADT: 50
NO DATA ENTERED
PoorOver: BOULDER CREEK
NO DATA ENTERED, Lemhi, ID
Built 1966 Load: 35.3 t ADT: 200
FDR 382
PoorOver: ELK CREEK
5 MILES FROM ELK RIVER ID, Clearwater, ID
Built 1961 Load: 36.3 t ADT: 20
FDR 382
PoorOver: ELK CREEK
4 MILES FROM ELK RIVER ID, Clearwater, ID
Built 1961 Load: 36.3 t ADT: 20
SALMON RIVER ROAD
PoorOver: PINE CREEK
PINE CREEK, Lemhi, ID
Built 2012 Load: 37.3 t ADT: 350
NO DATA ENTERED
PoorOver: OSIER CREEK
2.0 MI N OF OLD KELLY CR, Clearwater, ID
Built 1954 Load: 37.6 t ADT: 40
OR 86 (HWY 012)
PoorOver: SNAKE RIVER (OXBOW)
ORE-IDAHO STATE LINE, Adams, ID
Built 1961 Load: 38.9 t ADT: 98
OLD CHILLI ROAD
PoorOver: THOUSAND SPRINGS CREEK
12.6 N. 13.2 W. MACKAY, Custer, ID
Built 1926 Load: 39.9 t ADT: 80
BLUFF ROAD
PoorOver: BIG WILLOW CREEK
2.1N 2.4E NEW PLYMOUTH, Payette, ID
Built 1962 Load: 40.5 t ADT: 130
CROOKED RIVER ROAD
PoorOver: UPPER CROOKED RIVER
30.2 E 12.6 S GRANGEVILLE, Idaho, ID
Built 1965 Load: 40.8 t ADT: 50
IRR BIA RTE 11
PoorOver: LITTLE HANGMAN CREEK
2.4 KM SOUTH OF AGENCY, Benewah, ID
Built 1977 Load: 49.8 t ADT: 350
FALL CK.-ROCKY BAR
PoorOver: EAST FORK FALL CREEK
1 MI N.W. OF RED MOUNTAIN, Elmore, ID
Built 2013 Load: 50.2 t ADT: 50
STC 5711;MOON PASS
PoorOver: BIG DICK CREEK
5.6 N. 2.5 E. AVERY, Shoshone, ID
Built 1909 Load: 68.9 t ADT: 360
STC2714;3700 NORTH
PoorOver: ROCK CREEK
1.0 S. 0.4 E. TWIN FALLS, Twin Falls, ID
Built 1973 Load: 99.9 t ADT: 6,300
STC 3988;ROSEBERRY
PoorOver: WILLOW CREEK
1.5 E. DONNELLY, Valley, ID
Built 1996 Load: 99.9 t ADT: 350
Showing 1,701-1,742 of 1,742 bridges
Related
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.
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). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.
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.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.