US Bridges

Olson Road over Ziegler Creek

Fair

Grays Harbor County, Washington · 0.2 S JCT 9340 · Structure no. 081057000000000

Built
1985
40 years old
Condition
Fair
inspected March 2024
Type
Slab
Prestressed Concrete
Length
50 ft
2 main spans
Daily traffic
15
2020 count
Owner
County
County Highway Agency

About this bridge

Olson Road over Ziegler Creek is a prestressed concrete slab carrying Olson Road over Ziegler Creek in Grays Harbor County, Washington. It was built in 1985, so it is 40 years old, younger 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 15 vehicles a day, roughly 2% of them trucks, projected to reach 18 by 2040. The structure is 50 ft (15.3 m) long and 20 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesOlson Road
CrossesZiegler Creek
Location0.2 S JCT 9340
RouteCounty Highway 38450
CountyGrays Harbor County
StateWashington
Coordinates47.49278, -123.80175
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 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 alignment8: Equal to present desirable criteria
Operating rating34.6 US tons
Inventory rating25.4 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length50 ft (15.3 m)
Longest span31 ft (9.3 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2020)
Projected traffic18 by 2040
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Olson Road over Ziegler Creek built?

It was built in 1985, making it 40 years old in 2025.

What condition is Olson Road over Ziegler 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 March 2024.

How much traffic does Olson Road over Ziegler Creek carry?

About 15 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Olson Road over Ziegler Creek?

The structure is 50 ft (15.3 m) long with a longest span of 31 ft (9.3 m) and a deck 20 ft wide.

Who owns Olson Road over Ziegler Creek?

It is owned by the County Highway Agency.