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
CDA RIVER ROAD
FairOver: LOST CREEK
4.9 N. PRICHARD, Shoshone, ID
Built 1953 Load: 20.9 t ADT: 30
3100 EAST ROAD
FairOver: LOW LINE CANAL
4.2 S. 1.5 E. TWIN FALLS, Twin Falls, ID
Built 1965 Load: 20.9 t ADT: 140
1500 EAST ROAD
FairOver: LOW LINE CANAL
2.5 S. 0.5 E. BUHL, Twin Falls, ID
Built 1936 Load: 20.9 t ADT: 80
2100 EAST RD
FairOver: LOW LINE CANAL
1.1S 1.0W FILER;JRDN COR, Twin Falls, ID
Built 1968 Load: 20.9 t ADT: 150
1500 EAST ROAD
FairOver: HIGH LINE CANAL
7.2 S. 0.5 E. BUHL, Twin Falls, ID
Built 1930 Load: 20.9 t ADT: 20
2800 EAST RD
FairOver: HIGH LINE CANAL
4.8 S. 1.5 W. TWIN FALLS, Twin Falls, ID
Built 1972 Load: 20.9 t ADT: 90
2500 EAST ROAD
FairOver: LOW LINE CANAL
2.5 S. 2.7 E. FILER, Twin Falls, ID
Built 1930 Load: 20.9 t ADT: 140
N 1700 E
FairOver: LATERAL 17A
2.4 E. 3.3 S. BUHL, Twin Falls, ID
Built 1969 Load: 20.9 t ADT: 400
3200 EAST RD
FairOver: HIGH LINE CANAL
6.4 S. 2.5 E. TWIN FALLS, Twin Falls, ID
Built 1969 Load: 20.9 t ADT: 140
2500 EAST ROAD
FairOver: HIGH LINE CANAL
4.3 S. 2.7 E. FILER, Twin Falls, ID
Built 1964 Load: 20.9 t ADT: 140
RIVER ROAD
FairOver: MUD CREEK
4.2 N. 5.6 W. BUHL, Twin Falls, ID
Built 1983 Load: 20.9 t ADT: 60
LICK CREEK ROAD
FairOver: SECESH RIVER
20.2 E. MCCALL, Valley, ID
Built 1952 Load: 20.9 t ADT: 40
GOLD DUST ROAD
FairOver: BIG CREEK
2.3 S. 3.0 E. CASCADE, Valley, ID
Built 1975 Load: 20.9 t ADT: 70
DEADWOOD ROAD
FairOver: DEADWOOD RIVER
3 N. DEADWOOD RESV, Valley, ID
Built 1959 Load: 20.9 t ADT: 30
STC8217;COVE ROAD
FairOver: WEISER R;BACKWATER CH.BR
AT WEISER ECL;MAIN ST., Washington, ID
Built 1960 Load: 20.9 t ADT: 480
ROAD
FairOver: WILLOW CREEK
NO DATA ENTERED, Fremont, ID
Built 1975 Load: 21.1 t ADT: 50
FDR 103
FairOver: LOLO CREEK
1 MI WEST OF MUSSELSHELL, Idaho, ID
Built 1962 Load: 21.1 t ADT: 40
FOREST ROAD 648
FairOver: MEADOW CREEK
CAMP 58, Idaho, ID
Built 1991 Load: 21.1 t ADT: 50
FS ROUTE NO. 804
FairOver: MINERS CREEK
MINERS CREEK, Shoshone, ID
Built 1986 Load: 21.1 t ADT: 50
FDR
FairOver: NORTH FORK WOOD RIVER
1 MILE NORTH SNRA HQDS., Blaine, ID
Built 1956 Load: 21.4 t ADT: 50
SQ___ CREEK ROAD
FairOver: PAASASIKWANA NAOKWAIDE
NO DATA ENTERED, Custer, ID
Built 1964 Load: 21.4 t ADT: 20
FOREST ROAD 290
FairOver: MEADOW CREEK
INDIAN HILL, Idaho, ID
Built 1934 Load: 21.4 t ADT: 50
RIVER ROAD
FairOver: GREAT WESTERN CANAL
7.1 N. 1.1 W. IDAHO FALLS, Bonneville, ID
Built 1960 Load: 21.6 t ADT: 1,300
W 2000 S
FairOver: TEXAS SLOUGH CANAL
0.6 E. BURTON, Madison, ID
Built 1955 Load: 21.6 t ADT: 330
2100 EAST RD
FairOver: HIGH LINE CANAL
3.1S 1.0W FILER;JRDN COR, Twin Falls, ID
Built 1962 Load: 21.6 t ADT: 100
BEAVER-LOON ROAD
FairOver: LOON CREEK
NO DATA ENTERED, Custer, ID
Built 1957 Load: 21.7 t ADT: 10
ROAD
FairOver: TRAIL CREEK
NO DATA ENTERED, Teton, ID
Built 1965 Load: 21.7 t ADT: 50
FUNK ROAD
FairOver: LOW LINE CANAL
2.5S. 0.9E.ABERDEEN;2000S, Bingham, ID
Built 1958 Load: 21.8 t ADT: 200
STC 6712;S 25TH E
FairOver: TAYLOR CANAL
4.48 S. AMMON, Bonneville, ID
Built 1949 Load: 21.8 t ADT: 1,600
STC 5803;MOYIE RVR
FairOver: MOYIE RIVER;MEADOW CREEK
10.2 S. ADDIE, Boundary, ID
Built 1928 Load: 21.8 t ADT: 120
STEPHEN LANE
FairOver: RIVERSIDE CANAL
3.2 S. 0.7 W. PARMA, Canyon, ID
Built 1983 Load: 21.8 t ADT: 200
MOSCRIP ROAD
FairOver: OROFINO CREEK
IN PIERCE, Clearwater, ID
Built 1978 Load: 21.8 t ADT: 190
N 4950 E
FairOver: EAGLE ROCK CANAL
0.2 N. 3.1 E. RIRIE, Jefferson, ID
Built 1950 Load: 21.8 t ADT: 550
JENKINS ROAD
FairOver: COW CREEK
2.5 N. 1.6 E. GENESEE, Latah, ID
Built 1935 Load: 21.8 t ADT: 30
FS ROUTE NO. 447
FairOver: E.F. EMERALD
E.F. EMERALD CREEK, Benewah, ID
Built 1967 Load: 22.0 t ADT: 40
FDR
FairOver: WARM SPRINGS CREEK
16 MILES WEST OF KETCHUM, Blaine, ID
Built 1959 Load: 22.0 t ADT: 50
WILLIS FLAT ROAD
FairOver: SO.FK.PAYETTE RIVER
14 MI EAST OF LOWMAN, ID, Boise, ID
Built 1959 Load: 22.0 t ADT: 35
SQ___ CREEK ROAD
FairOver: JACKKNIFE CREEK
NO DATA ENTERED, Bonneville, ID
Built 1963 Load: 22.0 t ADT: 20
SMITH CREEK ROAD
FairOver: SMITH CREEK
2.8 MI. NE OF PRAIRIE, Elmore, ID
Built 1972 Load: 22.0 t ADT: 25
ROAD
FairOver: BIG SPRINGS OUTLET
NO DATA ENTERED, Fremont, ID
Built 1957 Load: 22.0 t ADT: 50
FDR 1433
FairOver: N FK PALOUSE
23 MILES FROM POTLATCH RS, Latah, ID
Built 1963 Load: 22.0 t ADT: 10
FS ROUTE NO. 321
FairOver: MARBLE CREEK
MARBLE CREEK, Shoshone, ID
Built 1959 Load: 22.0 t ADT: 50
FS ROUTE NO. 447
FairOver: EMERALD CREEK
EMERALD CREEK, Benewah, ID
Built 1967 Load: 22.4 t ADT: 50
FDR
FairOver: BIG SMOKY CREEK
2 MILES WEST BIG SMOKY JT, Camas, ID
Built 1953 Load: 22.4 t ADT: 50
SMITH CREEK ROAD
FairOver: SMITH CREEK
5.7 MI. NE OF PRAIRIE, Elmore, ID
Built 1972 Load: 22.4 t ADT: 25
BARBER FLAT ROAD
FairOver: NORTH FORK BOISE RIVER
25 MI EAST OF ID CITY, Elmore, ID
Built 1959 Load: 22.4 t ADT: 15
FOREST ROAD 1858
FairOver: NEWSOME CREEK
NEWSOME DRAINAGE, Idaho, ID
Built 1962 Load: 22.4 t ADT: 50
FOREST ROAD 1858
FairOver: NEWSOME CREEK
NEWSOME DRAINAGE, Idaho, ID
Built 1961 Load: 22.4 t ADT: 50
NO DATA ENTERED
FairOver: HAZARD CREEK
NO DATA ENTERED, Idaho, ID
Built 1951 Load: 22.4 t ADT: 50
FS ROUTE NO. 411
FairOver: BURNT CABIN CR
BURNT CABIN CREEK, Kootenai, ID
Built 1948 Load: 22.4 t ADT: 50
Showing 401-450 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.