Total Bridges
1,742
Public highway bridges in Idaho
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
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)
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
56
Wyoming
5.41% top marginal rate
16
Idaho
5.51% top marginal rate
28
Mississippi
5.92% top marginal rate
45
South Carolina
6.10% top marginal rate
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
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
Structurally DeficientOver: 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
I 90 EBL & WBL
UnknownOver: CROSSROAD BD;W.WALLACE I
IN WALLACE, Shoshone, ID
Built 1987 ADT: 1,100
I 90 EBL & WBL
UnknownOver: COPPER STREET GS
IN MULLAN;COPPER STREET, Shoshone, ID
Built 1973 ADT: 30
OLD RIVER ROAD
UnknownOver: ST JOE RIVER;AVERY BR
IN AVERY, Shoshone, ID
Built 1935 ADT: 360
SEVENTH STREET
UnknownOver: RESIDENCE STREET;VIADUCT
IN WALLACE, Shoshone, ID
Built 1984 ADT: 30
US 93; ON RAMP
UnknownOver: US 93
4.7 W. TWIN FALLS WCL, Twin Falls, ID
Built 2011 ADT: 5,400
NO DATA ENTERED
FairOver: BEAR CREEK
NO DATA ENTERED, Adams, ID
Built 1965 ADT: 50
50234
FairOver: COTTONWOOD CK
NO DATA ENTERED, Adams, ID
Built 1966 ADT: 10
NO DATA ENTERED
FairOver: E FK WEISER R
NO DATA ENTERED, Adams, ID
Built 1970 ADT: 50
FDR
FairOver: WOOD RIVER
12 MILES WEST SNRA HQDS, Blaine, ID
Built 1953 ADT: 50
FDR
FairOver: WARM SPRINGS CREEK
11 MILES WEST OF KETCHUM, Blaine, ID
Built 1991 ADT: 50
PINE CREEK ROAD
FairOver: GRIMES CREEK
9.5 MI S.W. OF ID CITY, Boise, ID
Built 1947 ADT: 25
FDR
FairOver: SOUTH FORK BOISE RIVER
UPPER SO.FK.BOISE RIVER, Camas, ID
Built 1976 ADT: 50
ROAD
FairOver: KAY CREEK
NO DATA ENTERED, Clark, ID
Built 1961 ADT: 50
NO DATA ENTERED
FairOver: OROGRANDE CREEK
PINE CREEK BRIDGE, Clearwater, ID
Built 1950 ADT: 40
FDR
FairOver: EAST FORK SALMON RIVER
22 MILES UP EAST FORK R., Custer, ID
Built 1989 ADT: 50
ROAD
FairOver: LUCKY DOG CREEK
NO DATA ENTERED, Fremont, ID
Built 1978 ADT: 50
LAKE CK ROAD 50104
FairOver: LAKE CREEK
NO DATA ENTERED, Idaho, ID
Built 1970 ADT: 50
FS ROUTE NO. 805
FairOver: WEST FORK EAGLE
W FK EAGLE CREEK, Shoshone, ID
Built 1957 ADT: 50
FS ROUTE NO. 805
FairOver: WEST FORK EAGLE CREEK
W FK EAGLE CREEK, Shoshone, ID
Built 1957 ADT: 50
FDR 715
FairOver: MEADOW CREEK
VIC 5-LAKES BUTTE TRAIL, Shoshone, ID
Built 1985 ADT: 10
NO DATA ENTERED
FairOver: N FK PAYETTE
NO DATA ENTERED, Valley, ID
Built 1958 ADT: 50
ADAMS CK RD 50025
FairOver: MANN CREEK
NO DATA ENTERED, Washington, ID
Built 1953 ADT: 50
STC3024;POLLARD LN
FairOver: MIDDLETON CANAL
0.6 N. 1.3 E. STAR, Ada, ID
Built 1967 Load: 3.6 t ADT: 1,300
20160
FairOver: WARM RIVER
NO DATA ENTERED, Fremont, ID
Built 1985 Load: 4.5 t ADT: 50
IRR BIA RTE 152
FairOver: PORTNEUF RIVER
5KM N OF I-86 AT SR30 EXI, Bannock, ID
Built 1960 Load: 5.4 t ADT: 600
OGLE LANE
FairOver: LITTLE WEISER RIVER
1.0N 1.1W INDIAN VALLEY, Adams, ID
Built 1982 Load: 6.4 t ADT: 50
AIRPORT ROAD
FairOver: BEAR RIVER
2.2 N. 1.1 W. DINGLE, Bear Lake, ID
Built 1916 Load: 6.4 t ADT: 50
GRAVY RIDGE ROAD
FairOver: CAMAS CREEK
0.7 N. 11.0 E. DUBOIS, Clark, ID
Built 1956 Load: 6.4 t ADT: 10
SPERRY GRADE RD
FairOver: POTLATCH RVR(SPERRY BR)
AT KENDRICK SCL, Nez Perce, ID
Built 1908 Load: 6.4 t ADT: 170
STC2815;WARM SPRNG
FairOver: BIG WOOD RIVER
IN KETCHUM;WARM SPRING RD, Blaine, ID
Built 1972 Load: 7.3 t ADT: 5,900
1050 EAST ROAD
FairOver: BILLINGSLEY CREEK
0.6 N. 1.1 E. HAGERMAN, Gooding, ID
Built 1950 Load: 7.3 t ADT: 50
N 45TH E
FairOver: NORTH FORK WILLOW CR
1.6 S. 1.0 E. UCON, Bonneville, ID
Built 1958 Load: 8.2 t ADT: 2,000
1200 SOUTH ROAD
FairOver: CLOVER CREEK
6.9 N. 3.0 W. BLISS, Gooding, ID
Built 1915 Load: 8.2 t ADT: 50
NO DATA ENTERED
FairOver: YANKEE FORK
NO DATA ENTERED, Custer, ID
Built 1972 Load: 8.4 t ADT: 50
FS ROUTE NO. 208
FairOver: CDA RIVER
2.5 MI FROM SHOSHONE W.C., Shoshone, ID
Built 1952 Load: 8.7 t ADT: 50
650 WEST ROAD
FairOver: MILNER GOODING CANAL
6.9 N. 6.4 W. SHOSHONE, Lincoln, ID
Built 1955 Load: 9.1 t ADT: 110
LITTLE CANYON ROAD
FairOver: BIG CANYON CREEK
0.4 S. 0.3 E. PECK, Nez Perce, ID
Built 1930 Load: 9.1 t ADT: 190
CARMEN CREEK ROAD
FairOver: CARMEN CREEK
NO DATA ENTERED, Lemhi, ID
Built 1961 Load: 10.0 t ADT: 10
2407: WENDELL SHEE
FairOver: Twin Falls N. Side Canal
7.2 mi E of ID46, Jerome, ID
Built 1984 Load: 10.4 t ADT: 25
FDR 105
FairOver: NF CLEARWATER RIVER
WEITAS CREEK & NF CLW RIV, Clearwater, ID
Built 1937 Load: 10.7 t ADT: 20
MINGO ROAD
FairOver: BENCH CANAL
0.2 N. 0.2 E. GRACE, Caribou, ID
Built 2012 Load: 10.9 t ADT: 30
OLD HIGHWAY 95
FairOver: SLATE CREEK
0.2 N. SLATE CREEK R.STA, Idaho, ID
Built 1920 Load: 10.9 t ADT: 50
NO DATA ENTERED
FairOver: YANKEE FORK
NO DATA ENTERED, Custer, ID
Built 1972 Load: 11.3 t ADT: 50
OLD HWY 91
FairOver: PLEASANT VALLEY CREEK
6.9 N. 1.5 W. SPENCER, Clark, ID
Built 1934 Load: 11.8 t ADT: 50
STC 4751;CTTNWD CR
FairOver: COYOTE CREEK
3.1 S. 3.0 E. MYRTLE, Nez Perce, ID
Built 1938 Load: 11.8 t ADT: 40
FS ROUTE #231
FairOver: PACK RIVER
20 MILES FROM SAMUEL, ID, Boundary, ID
Built 1988 Load: 12.0 t ADT: 50
NO DATA ENTERED
FairOver: BIG CREEK
BIG CREEK, Shoshone, ID
Built 1939 Load: 12.0 t ADT: 50
FOREST ROAD 443
FairOver: SELWAY RIVER
SELWAY FALLS, Idaho, ID
Built 1934 Load: 12.6 t ADT: 50
FS ROUTE 3099
FairOver: CDA RIVER
15.5 MI F/MAGEE R.S., Shoshone, ID
Built 1954 Load: 12.6 t ADT: 50
COUNTY ROAD
FairOver: N.FK.SKOOKUMCHUCK CREEK
3.0 S. 4.0 E. WHITEBIRD, Idaho, ID
Built 1965 Load: 12.7 t ADT: 50
Showing 101-150 of 1,742 bridges
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.
| Publisher | Kiznis Studio |
| Sources | FHWA National Bridge Inventory, public U.S. government datasets |