US Bridges

SR 105 over Drainage

Fair

Pacific County, Washington · 16.2 N JCT US 101 · Structure no. 002002730000000

Built
1959
66 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete Continuous
Length
23 ft
2 main spans
Daily traffic
1,099
2023 count
Owner
State
State Highway Agency

About this bridge

SR 105 over Drainage is a concrete continuous culvert carrying SR 105 over Drainage in Pacific County, Washington. It was built in 1959, so it is 66 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 1,099 vehicles a day, roughly 12% of them trucks, projected to reach 1,302 by 2039. The structure is 23 ft (7 m) long. If it were closed, the detour would be 88.2 mi (142 km).

Location

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CarriesSR 105
CrossesDrainage
Location16.2 N JCT US 101
RouteState Highway 105
CountyPacific County
StateWashington
Coordinates46.74029, -123.97567
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45 US tons
Inventory rating27 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 15
Structure length23 ft (7 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,099 (2023)
Projected traffic1,302 by 2039
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed88.2 mi (142 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$393,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 105 over Drainage built?

It was built in 1959, making it 66 years old in 2025.

What condition is SR 105 over Drainage 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 June 2023.

How much traffic does SR 105 over Drainage carry?

About 1,099 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is SR 105 over Drainage?

The structure is 23 ft (7 m) long with a longest span of 11 ft (3.4 m).

Who owns SR 105 over Drainage?

It is owned by the State Highway Agency.