US Bridges

US 101 over Unnamed Tributary

Good

Grays Harbor County, Washington · 15.3 N JCT SR 109 · Structure no. 0019567A0000000

Built
2023
2 years old
Condition
Good
inspected April 2024
Type
Culvert
Concrete
Length
26 ft
1 main span
Daily traffic
2,503
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Unnamed Tributary is a concrete culvert carrying US 101 over Unnamed Tributary in Grays Harbor County, Washington. It was built in 2023, so it is 2 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,503 vehicles a day, roughly 14% of them trucks, projected to reach 2,710 by 2039. The structure is 26 ft (8 m) long and 78 ft wide. If it were closed, the detour would be 31.7 mi (51 km).

Location

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CarriesUS 101
CrossesUnnamed Tributary
Location15.3 N JCT SR 109
RouteU.S. Route 101
CountyGrays Harbor County
StateWashington
Coordinates47.17307, -123.88694
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating37.5 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHL 93
Structure length26 ft (8 m)
Longest span26 ft (8 m)
Deck width78 ft (23.9 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,503 (2023)
Projected traffic2,710 by 2039
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.7 mi (51 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$480,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 101 over Unnamed Tributary built?

It was built in 2023, making it 2 years old in 2025.

What condition is US 101 over Unnamed Tributary in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does US 101 over Unnamed Tributary carry?

About 2,503 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is US 101 over Unnamed Tributary?

The structure is 26 ft (8 m) long with a longest span of 26 ft (8 m) and a deck 78 ft wide.

Who owns US 101 over Unnamed Tributary?

It is owned by the State Highway Agency.