US Bridges

NELSON/1460 over Cedar Creek

Fair

Whitman County, Washington · 0.16 MI N Grinnell · Structure no. 082403000000000

Built
1965
60 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
40
2021 count
Owner
County
County Highway Agency

About this bridge

NELSON/1460 over Cedar Creek is a prestressed concrete stringer/multi-beam or girder carrying NELSON/1460 over Cedar Creek in Whitman County, Washington. It was built in 1965, so it is 60 years old, older 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 40 vehicles a day, roughly 25% of them trucks, projected to reach 41 by 2044. The structure is 30 ft (9.1 m) long and 20 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesNELSON/1460
CrossesCedar Creek
Location0.16 MI N Grinnell
RouteCounty Highway 14600
CountyWhitman County
StateWashington
Coordinates46.9682, -117.04805
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.8 US tons
Inventory rating25.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadH 20
Structure length30 ft (9.1 m)
Longest span29 ft (8.7 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2021)
Projected traffic41 by 2044
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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$1.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was NELSON/1460 over Cedar Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is NELSON/1460 over Cedar 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 November 2023.

How much traffic does NELSON/1460 over Cedar Creek carry?

About 40 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is NELSON/1460 over Cedar Creek?

The structure is 30 ft (9.1 m) long with a longest span of 29 ft (8.7 m) and a deck 20 ft wide.

Who owns NELSON/1460 over Cedar Creek?

It is owned by the County Highway Agency.