US Bridges

SH 71 over Spring Creek

Fair

Washington County, Idaho · 0.8 W. Cambridge · Structure no. 000000000015205

Built
1958
67 years old
Condition
Fair
inspected July 2023
Type
Frame
Concrete
Length
26 ft
1 main span
Daily traffic
780
2023 count
Owner
State
State Highway Agency

About this bridge

SH 71 over Spring Creek is a concrete frame carrying SH 71 over Spring Creek in Washington County, Idaho. It was built in 1958, so it is 67 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 780 vehicles a day, roughly 4% of them trucks, projected to reach 1,170 by 2042. The structure is 26 ft (7.9 m) long and 34 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSH 71
CrossesSpring Creek
Location0.8 W. Cambridge
RouteState Highway 71
CountyWashington County
StateIdaho
Coordinates44.57474, -116.69492
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating40 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span24 ft (7.3 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic780 (2023)
Projected traffic1,170 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$235,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 71 over Spring Creek built?

It was built in 1958, making it 67 years old in 2025.

What condition is SH 71 over Spring Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2023.

How much traffic does SH 71 over Spring Creek carry?

About 780 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is SH 71 over Spring Creek?

The structure is 26 ft (7.9 m) long with a longest span of 24 ft (7.3 m) and a deck 34 ft wide.

Who owns SH 71 over Spring Creek?

It is owned by the State Highway Agency.