US Bridges

SR 105 over Chapin Creek

Fair

Grays Harbor County, Washington · 13.6 N JCT SR 105 SP · Structure no. 0002621A0000000

Built
1940
85 years old
Condition
Fair
inspected June 2024
Type
Slab
Wood or Timber
Length
62 ft
4 main spans
Daily traffic
6,124
2023 count
Owner
State
State Highway Agency

About this bridge

SR 105 over Chapin Creek is a wood or timber slab carrying SR 105 over Chapin Creek in Grays Harbor County, Washington. It was built in 1940, so it is 85 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 6,124 vehicles a day, roughly 6% of them trucks, projected to reach 7,343 by 2039. The structure is 62 ft (18.9 m) long and 31 ft wide. If it were closed, the detour would be 70.8 mi (114 km).

Location

Open in Google Maps
CarriesSR 105
CrossesChapin Creek
Location13.6 N JCT SR 105 SP
RouteState Highway 105
CountyGrays Harbor County
StateWashington
Coordinates46.94, -123.87736
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 rating99 US tons
Inventory rating73 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans4
Design loadH 15
Structure length62 ft (18.9 m)
Longest span15 ft (4.6 m)
Deck width31 ft (9.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,124 (2023)
Projected traffic7,343 by 2039
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed70.8 mi (114 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$1.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 105 over Chapin Creek built?

It was built in 1940, making it 85 years old in 2025.

What condition is SR 105 over Chapin Creek 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 2024.

How much traffic does SR 105 over Chapin Creek carry?

About 6,124 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is SR 105 over Chapin Creek?

The structure is 62 ft (18.9 m) long with a longest span of 15 ft (4.6 m) and a deck 31 ft wide.

Who owns SR 105 over Chapin Creek?

It is owned by the State Highway Agency.