US Bridges

SUNSET/3360 over Cottonwood Creek

Fair

Whitman County, Washington · 5.08 MI NE Pne Cty-Malden · Structure no. 083565000000000

Built
1981
44 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
36 ft
1 main span
Daily traffic
70
2021 count
Owner
County
County Highway Agency

About this bridge

SUNSET/3360 over Cottonwood Creek is a prestressed concrete stringer/multi-beam or girder carrying SUNSET/3360 over Cottonwood Creek in Whitman County, Washington. It was built in 1981, so it is 44 years old, younger than the Washington average of 49.8 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 70 vehicles a day, roughly 25% of them trucks, projected to reach 70 by 2044. The structure is 36 ft (11 m) long and 28 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

Open in Google Maps
CarriesSUNSET/3360
CrossesCottonwood Creek
Location5.08 MI NE Pne Cty-Malden
RouteCounty Highway 33600
CountyWhitman County
StateWashington
Coordinates47.11683, -117.47492
Functional classRural Minor 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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating52.5 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length36 ft (11 m)
Longest span34 ft (10.5 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2021)
Projected traffic70 by 2044
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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$1.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SUNSET/3360 over Cottonwood Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is SUNSET/3360 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 December 2023.

How much traffic does SUNSET/3360 over Cottonwood Creek carry?

About 70 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is SUNSET/3360 over Cottonwood Creek?

The structure is 36 ft (11 m) long with a longest span of 34 ft (10.5 m) and a deck 28 ft wide.

Who owns SUNSET/3360 over Cottonwood Creek?

It is owned by the County Highway Agency.