US Bridges

Rock LAKE/3010 over Rock Creek

Good

Whitman County, Washington · 10.44 MI S Belsby · Structure no. 081587000000000

Built
1978
47 years old
Condition
Good
inspected December 2023
Type
Tee Beam
Prestressed Concrete
Length
200 ft
2 main spans
Daily traffic
221
2021 count
Owner
County
County Highway Agency

About this bridge

Rock LAKE/3010 over Rock Creek is a prestressed concrete tee beam carrying Rock LAKE/3010 over Rock Creek in Whitman County, Washington. It was built in 1978, so it is 47 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 221 vehicles a day, roughly 25% of them trucks, projected to reach 221 by 2044. The structure is 200 ft (61 m) long and 28 ft wide. If it were closed, the detour would be 75.2 mi (121 km).

Location

Open in Google Maps
CarriesRock LAKE/3010
CrossesRock Creek
Location10.44 MI S Belsby
RouteCounty Highway 30100
CountyWhitman County
StateWashington
Coordinates47.13902, -117.72627
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 alignment6: Equal to present minimum criteria
Operating rating61.4 US tons
Inventory rating36.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans2
Design loadHS 20
Structure length200 ft (61 m)
Longest span99 ft (30.2 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic221 (2021)
Projected traffic221 by 2044
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed75.2 mi (121 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$7.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Rock LAKE/3010 over Rock Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is Rock LAKE/3010 over Rock Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.

How much traffic does Rock LAKE/3010 over Rock Creek carry?

About 221 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is Rock LAKE/3010 over Rock Creek?

The structure is 200 ft (61 m) long with a longest span of 99 ft (30.2 m) and a deck 28 ft wide.

Who owns Rock LAKE/3010 over Rock Creek?

It is owned by the County Highway Agency.