US Bridges

SR 505 over Lacamas Creek

Good

Lewis County, Washington · 0.5 E JCT I-5 · Structure no. 079725000000000

Built
1955
70 years old
Condition
Good
inspected May 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
184 ft
4 main spans
Daily traffic
3,867
2023 count
Owner
State
State Highway Agency

About this bridge

SR 505 over Lacamas Creek is a concrete continuous box beam or girders - multiple carrying SR 505 over Lacamas Creek in Lewis County, Washington. It was built in 1955, so it is 70 years old, older 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 3,867 vehicles a day, roughly 7% of them trucks, projected to reach 4,712 by 2039. The structure is 184 ft (56.1 m) long and 34 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSR 505
CrossesLacamas Creek
Location0.5 E JCT I-5
RouteState Highway 505
CountyLewis County
StateWashington
Coordinates46.47281, -122.87311
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.8 US tons
Inventory rating36.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length184 ft (56.1 m)
Longest span77 ft (23.5 m)
Deck width34 ft (10.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,867 (2023)
Projected traffic4,712 by 2039
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.2 mi (10 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$3.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 505 over Lacamas Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is SR 505 over Lacamas 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 May 2023.

How much traffic does SR 505 over Lacamas Creek carry?

About 3,867 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is SR 505 over Lacamas Creek?

The structure is 184 ft (56.1 m) long with a longest span of 77 ft (23.5 m) and a deck 34 ft wide.

Who owns SR 505 over Lacamas Creek?

It is owned by the State Highway Agency.