US Bridges

STC4759;WEBB RD over Sweetwater Creek

Fair

Nez Perce County, Idaho · 2.0 SW Sweetwater · Structure no. 000000000020250

Built
1949
76 years old, rebuilt 1990
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
30 ft
1 main span
Daily traffic
2,000
2023 count
Owner
County
County Highway Agency

About this bridge

STC4759;WEBB RD over Sweetwater Creek is a steel stringer/multi-beam or girder carrying STC4759;WEBB RD over Sweetwater Creek in Nez Perce County, Idaho. It was built in 1949 and reconstructed in 1990, so it is 76 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 2,000 vehicles a day, roughly 15% of them trucks, projected to reach 3,000 by 2042. The structure is 30 ft (9.1 m) long and 24 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesSTC4759;WEBB RD
CrossesSweetwater Creek
Location2.0 SW Sweetwater
RouteCounty Highway 4759
CountyNez Perce County
StateIdaho
Coordinates46.34742, -116.82744
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82 US tons
Inventory rating49.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadH 20
Structure length30 ft (9.1 m)
Longest span29 ft (8.8 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2023)
Projected traffic3,000 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$530,000 (2018 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was STC4759;WEBB RD over Sweetwater Creek built?

It was built in 1949, making it 76 years old in 2025. It was reconstructed in 1990.

What condition is STC4759;WEBB RD over Sweetwater 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 2024.

How much traffic does STC4759;WEBB RD over Sweetwater Creek carry?

About 2,000 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is STC4759;WEBB RD over Sweetwater Creek?

The structure is 30 ft (9.1 m) long with a longest span of 29 ft (8.8 m) and a deck 24 ft wide.

Who owns STC4759;WEBB RD over Sweetwater Creek?

It is owned by the County Highway Agency.