US Bridges

STC4751;CTTNWD Crk over Cottonwood Creek

FairPosted for load

Nez Perce County, Idaho · 3.8 N. 0.8 E. Culdesac · Structure no. 000000000029930

Built
1968
57 years old
Condition
Fair
inspected September 2024
Type
Girder and Floorbeam System
Steel
Length
51 ft
1 main span
Daily traffic
40
2023 count
Owner
County
County Highway Agency

About this bridge

STC4751;CTTNWD Crk over Cottonwood Creek is a steel girder and floorbeam system carrying STC4751;CTTNWD Crk over Cottonwood Creek in Nez Perce County, Idaho. It was built in 1968, so it is 57 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 40 vehicles a day, roughly 50% of them trucks, projected to reach 60 by 2042. The structure is 51 ft (15.5 m) long and 28 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

Location

Open in Google Maps
CarriesSTC4751;CTTNWD Crk
CrossesCottonwood Creek
Location3.8 N. 0.8 E. Culdesac
RouteCounty Highway 4751
CountyNez Perce County
StateIdaho
Coordinates46.42961, -116.65978
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating37 US tons
Inventory rating22 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadH 20
Structure length51 ft (15.5 m)
Longest span50 ft (15.2 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2023)
Projected traffic60 by 2042
Trucks50%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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$380,000
NavigationNo navigation control on waterway

Frequently asked questions

When was STC4751;CTTNWD Crk over Cottonwood Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is STC4751;CTTNWD Crk over Cottonwood 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 September 2024.

How much traffic does STC4751;CTTNWD Crk over Cottonwood Creek carry?

About 40 vehicles per day (2023 count), of which roughly 50% are trucks.

How long is STC4751;CTTNWD Crk over Cottonwood Creek?

The structure is 51 ft (15.5 m) long with a longest span of 50 ft (15.2 m) and a deck 28 ft wide.

Who owns STC4751;CTTNWD Crk over Cottonwood Creek?

It is owned by the County Highway Agency.