US Bridges

N. Shore Road over Tahuya River

Good

Mason County, Washington · 5.31 W Old Belfair Hyw · Structure no. 089517000000000

Built
2024
1 years old
Condition
Good
inspected September 2024
Type
Culvert
Aluminum, Wrought Iron, or Cast Iron
Length
34 ft
1 main span
Daily traffic
1,050
2024 count
Owner
County
County Highway Agency

About this bridge

N. Shore Road over Tahuya River is a aluminum, wrought iron, or cast iron culvert carrying N. Shore Road over Tahuya River in Mason County, Washington. It was built in 2024, so it is 1 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 1,050 vehicles a day, projected to reach 1,360 by 2044. The structure is 34 ft (10.4 m) long and 36 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesN. Shore Road
CrossesTahuya River
Location5.31 W Old Belfair Hyw
RouteCounty Highway 79800
CountyMason County
StateWashington
Coordinates47.51446, -122.88284
Functional classRural Minor Collector

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 inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating95.3 US tons
Inventory rating73.5 US tons

Structure

Structure typeCulvert
MaterialAluminum, Wrought Iron, or Cast Iron
DeckNot applicable
Main spans1
Design loadHL 93
Structure length34 ft (10.4 m)
Longest span34 ft (10.4 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,050 (2024)
Projected traffic1,360 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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$1.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was N. Shore Road over Tahuya River built?

It was built in 2024, making it 1 years old in 2025.

What condition is N. Shore Road over Tahuya River 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 September 2024.

How much traffic does N. Shore Road over Tahuya River carry?

About 1,050 vehicles per day (2024 count).

How long is N. Shore Road over Tahuya River?

The structure is 34 ft (10.4 m) long with a longest span of 34 ft (10.4 m) and a deck 36 ft wide.

Who owns N. Shore Road over Tahuya River?

It is owned by the County Highway Agency.