US Bridges

Curtis Hill Rd. over Lake Cr.

Fair

Lewis County, Washington · 3. SW Adna · Structure no. 084094000000000

Built
1960
65 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
46 ft
1 main span
Daily traffic
642
2022 count
Owner
County
County Highway Agency

About this bridge

Curtis Hill Rd. over Lake Cr. is a prestressed concrete stringer/multi-beam or girder carrying Curtis Hill Rd. over Lake Cr. 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 642 vehicles a day, roughly 16% of them trucks, projected to reach 1,160 by 2042. The structure is 46 ft (14 m) long and 26 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesCurtis Hill Rd.
CrossesLake Cr.
Location3. SW Adna
RouteCounty Highway 23650
CountyLewis County
StateWashington
Coordinates46.58738, -123.11105
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length46 ft (14 m)
Longest span44 ft (13.4 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic642 (2022)
Projected traffic1,160 by 2042
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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$656,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Curtis Hill Rd. over Lake Cr. built?

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

What condition is Curtis Hill Rd. over Lake Cr. 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 February 2023.

How much traffic does Curtis Hill Rd. over Lake Cr. carry?

About 642 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is Curtis Hill Rd. over Lake Cr.?

The structure is 46 ft (14 m) long with a longest span of 44 ft (13.4 m) and a deck 26 ft wide.

Who owns Curtis Hill Rd. over Lake Cr.?

It is owned by the County Highway Agency.