US Bridges

SR 109 over Copalis R

Fair

Grays Harbor County, Washington · 5.3 N JCT SR 115 · Structure no. 0004103A0000000

Built
1952
73 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
268 ft
14 main spans
Daily traffic
1,372
2023 count
Owner
State
State Highway Agency

About this bridge

SR 109 over Copalis R is a wood or timber stringer/multi-beam or girder carrying SR 109 over Copalis R in Grays Harbor County, Washington. It was built in 1952, so it is 73 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 1,372 vehicles a day, roughly 7% of them trucks, projected to reach 1,489 by 2039. The structure is 268 ft (81.7 m) long and 30 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
CarriesSR 109
CrossesCopalis R
Location5.3 N JCT SR 115
RouteState Highway 109
CountyGrays Harbor County
StateWashington
Coordinates47.115, -124.16917
Functional classRural Major 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 alignment6: Equal to present minimum criteria
Operating rating40 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans14
Design loadH 15
Structure length268 ft (81.7 m)
Longest span19 ft (5.8 m)
Deck width30 ft (9.1 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,372 (2023)
Projected traffic1,489 by 2039
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed21.1 mi (34 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$4.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 109 over Copalis R built?

It was built in 1952, making it 73 years old in 2025.

What condition is SR 109 over Copalis R 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 May 2024.

How much traffic does SR 109 over Copalis R carry?

About 1,372 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is SR 109 over Copalis R?

The structure is 268 ft (81.7 m) long with a longest span of 19 ft (5.8 m) and a deck 30 ft wide.

Who owns SR 109 over Copalis R?

It is owned by the State Highway Agency.