US Bridges

SR 109 over Chenois Creek

Fair

Grays Harbor County, Washington · 8.7 N JCT US 101 · Structure no. 0005197B0000000

Built
1956
69 years old
Condition
Fair
inspected June 2024
Type
Slab
Concrete Continuous
Length
150 ft
6 main spans
Daily traffic
6,904
2023 count
Owner
State
State Highway Agency

About this bridge

SR 109 over Chenois Creek is a concrete continuous slab carrying SR 109 over Chenois Creek in Grays Harbor County, Washington. It was built in 1956, so it is 69 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 6,904 vehicles a day, roughly 6% of them trucks, projected to reach 7,770 by 2039. The structure is 150 ft (45.7 m) long and 34 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

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CarriesSR 109
CrossesChenois Creek
Location8.7 N JCT US 101
RouteState Highway 109
CountyGrays Harbor County
StateWashington
Coordinates47.03111, -124.0255
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 above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating33.6 US tons
Inventory rating25.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 15
Structure length150 ft (45.7 m)
Longest span31 ft (9.4 m)
Deck width34 ft (10.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,904 (2023)
Projected traffic7,770 by 2039
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed19.9 mi (32 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$2.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 109 over Chenois Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is SR 109 over Chenois 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 109 over Chenois Creek carry?

About 6,904 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is SR 109 over Chenois Creek?

The structure is 150 ft (45.7 m) long with a longest span of 31 ft (9.4 m) and a deck 34 ft wide.

Who owns SR 109 over Chenois Creek?

It is owned by the State Highway Agency.