US Bridges

SR 500 over Lacamas Lake

Poor

Clark County, Washington · 12.6 E JCT SR 503 · Structure no. 000000II0000000

Built
1930
95 years old
Condition
Poor
inspected October 2023
Type
Tee Beam
Concrete Continuous
Length
79 ft
3 main spans
Daily traffic
11,155
2023 count
Owner
State
State Highway Agency

About this bridge

SR 500 over Lacamas Lake is a concrete continuous tee beam carrying SR 500 over Lacamas Lake in Clark County, Washington. It was built in 1930, so it is 95 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 11,155 vehicles a day, roughly 4% of them trucks, projected to reach 16,358 by 2039. The structure is 79 ft (24.1 m) long and 32 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesSR 500
CrossesLacamas Lake
Location12.6 E JCT SR 503
RouteState Highway 500
CountyClark County
StateWashington
Coordinates45.60439, -122.40714
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating27.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length79 ft (24.1 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,155 (2023)
Projected traffic16,358 by 2039
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$976,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 500 over Lacamas Lake built?

It was built in 1930, making it 95 years old in 2025.

What condition is SR 500 over Lacamas Lake in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2023.

How much traffic does SR 500 over Lacamas Lake carry?

About 11,155 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is SR 500 over Lacamas Lake?

The structure is 79 ft (24.1 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns SR 500 over Lacamas Lake?

It is owned by the State Highway Agency.