US Bridges

SR 706 over Copper CR

Fair

Pierce County, Washington · 11.2 E JCT SR 7 · Structure no. 000000HA0000000

Built
1922
103 years old
Condition
Fair
inspected April 2023
Type
Tee Beam
Concrete
Length
26 ft
1 main span
Daily traffic
2,249
2023 count
Owner
State
State Highway Agency

About this bridge

SR 706 over Copper CR is a concrete tee beam carrying SR 706 over Copper CR in Pierce County, Washington. It was built in 1922, so it is 103 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 2,249 vehicles a day, roughly 4% of them trucks, projected to reach 3,204 by 2039. The structure is 26 ft (7.9 m) long and 27 ft wide. If it were closed, the detour would be 26.7 mi (43 km).

Location

Open in Google Maps
CarriesSR 706
CrossesCopper CR
Location11.2 E JCT SR 7
RouteState Highway 706
CountyPierce County
StateWashington
Coordinates46.75531, -121.96144
Functional classRural Minor Arterial

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 protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating27.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length26 ft (7.9 m)
Longest span22 ft (6.7 m)
Deck width27 ft (8.2 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,249 (2023)
Projected traffic3,204 by 2039
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.7 mi (43 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$346,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 706 over Copper CR built?

It was built in 1922, making it 103 years old in 2025.

What condition is SR 706 over Copper CR 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 April 2023.

How much traffic does SR 706 over Copper CR carry?

About 2,249 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is SR 706 over Copper CR?

The structure is 26 ft (7.9 m) long with a longest span of 22 ft (6.7 m) and a deck 27 ft wide.

Who owns SR 706 over Copper CR?

It is owned by the State Highway Agency.