US Bridges

Roundtree Road over Lost Valley Creek

Fair

Lewis County, Washington · 0.5 W Boistfort · Structure no. 079805000000000

Built
1960
65 years old
Condition
Fair
inspected December 2022
Type
Stringer/Multi-beam or Girder
Concrete
Length
28 ft
1 main span
Daily traffic
32
2022 count
Owner
County
County Highway Agency

About this bridge

Roundtree Road over Lost Valley Creek is a concrete stringer/multi-beam or girder carrying Roundtree Road over Lost Valley Creek in Lewis County, Washington. It was built in 1960, so it is 65 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 32 vehicles a day, roughly 31% of them trucks, projected to reach 58 by 2042. The structure is 28 ft (8.5 m) long and 22 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesRoundtree Road
CrossesLost Valley Creek
Location0.5 W Boistfort
RouteCounty Highway 25470
CountyLewis County
StateWashington
Coordinates46.55048, -123.1433
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating72 US tons
Inventory rating43 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length28 ft (8.5 m)
Longest span26 ft (7.9 m)
Deck width22 ft (6.6 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32 (2022)
Projected traffic58 by 2042
Trucks31%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$426,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Roundtree Road over Lost Valley Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is Roundtree Road over Lost Valley 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 2022.

How much traffic does Roundtree Road over Lost Valley Creek carry?

About 32 vehicles per day (2022 count), of which roughly 31% are trucks.

How long is Roundtree Road over Lost Valley Creek?

The structure is 28 ft (8.5 m) long with a longest span of 26 ft (7.9 m) and a deck 22 ft wide.

Who owns Roundtree Road over Lost Valley Creek?

It is owned by the County Highway Agency.