US Bridges

Deckerville Road over Decker Creek

Fair

Mason County, Washington · 2.84 W JCT Matlock · Structure no. 080806000000000

Built
1949
76 years old, rebuilt 1962
Condition
Fair
inspected July 2023
Type
Tee Beam
Concrete
Length
26 ft
1 main span
Daily traffic
149
2020 count
Owner
County
County Highway Agency

About this bridge

Deckerville Road over Decker Creek is a concrete tee beam carrying Deckerville Road over Decker Creek in Mason County, Washington. It was built in 1949 and reconstructed in 1962, so it is 76 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 149 vehicles a day, roughly 20% of them trucks, projected to reach 250 by 2040. The structure is 26 ft (8 m) long and 26 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
CarriesDeckerville Road
CrossesDecker Creek
Location2.84 W JCT Matlock
RouteCounty Highway 800
CountyMason County
StateWashington
Coordinates47.22786, -123.47044
Functional classRural Minor Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating23 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadH 20
Structure length26 ft (8 m)
Longest span24 ft (7.4 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic149 (2020)
Projected traffic250 by 2040
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 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$1.1 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Deckerville Road over Decker Creek built?

It was built in 1949, making it 76 years old in 2025. It was reconstructed in 1962.

What condition is Deckerville Road over Decker 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 July 2023.

How much traffic does Deckerville Road over Decker Creek carry?

About 149 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is Deckerville Road over Decker Creek?

The structure is 26 ft (8 m) long with a longest span of 24 ft (7.4 m) and a deck 26 ft wide.

Who owns Deckerville Road over Decker Creek?

It is owned by the County Highway Agency.