US Bridges

Case Road over Beaver Creek

Fair

Thurston County, Washington · 0.5 M S Maytown RD · Structure no. 080826000000000

Built
1970
55 years old
Condition
Fair
inspected September 2024
Type
Slab
Concrete Continuous
Length
59 ft
3 main spans
Daily traffic
3,040
2020 count
Owner
County
County Highway Agency

About this bridge

Case Road over Beaver Creek is a concrete continuous slab carrying Case Road over Beaver Creek in Thurston County, Washington. It was built in 1970, so it is 55 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 3,040 vehicles a day, roughly 15% of them trucks, projected to reach 4,793 by 2042. The structure is 59 ft (18 m) long and 30 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesCase Road
CrossesBeaver Creek
Location0.5 M S Maytown RD
RouteCounty Highway 10710
CountyThurston County
StateWashington
Coordinates46.89094, -122.96584
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating77.9 US tons
Inventory rating59 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length59 ft (18 m)
Longest span22 ft (6.7 m)
Deck width30 ft (9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,040 (2020)
Projected traffic4,793 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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$2.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Case Road over Beaver Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is Case Road over Beaver 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 September 2024.

How much traffic does Case Road over Beaver Creek carry?

About 3,040 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Case Road over Beaver Creek?

The structure is 59 ft (18 m) long with a longest span of 22 ft (6.7 m) and a deck 30 ft wide.

Who owns Case Road over Beaver Creek?

It is owned by the County Highway Agency.