US Bridges

SR 7 over Ohop Slough

Fair

Pierce County, Washington · 3.4 N JCT SR 161 · Structure no. 0000572A0000000

Built
1922
103 years old
Condition
Fair
inspected September 2023
Type
Tee Beam
Concrete Continuous
Length
77 ft
3 main spans
Daily traffic
2,780
2023 count
Owner
State
State Highway Agency

About this bridge

SR 7 over Ohop Slough is a concrete continuous tee beam carrying SR 7 over Ohop Slough 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 5 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 2,780 vehicles a day, roughly 9% of them trucks, projected to reach 2,990 by 2039. The structure is 77 ft (23.5 m) long and 25 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesSR 7
CrossesOhop Slough
Location3.4 N JCT SR 161
RouteState Highway 7
CountyPierce County
StateWashington
Coordinates46.86433, -122.34378
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating33.6 US tons
Inventory rating26.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length77 ft (23.5 m)
Longest span31 ft (9.4 m)
Deck width25 ft (7.7 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,780 (2023)
Projected traffic2,990 by 2039
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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$1.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 7 over Ohop Slough built?

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

What condition is SR 7 over Ohop Slough 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 2023.

How much traffic does SR 7 over Ohop Slough carry?

About 2,780 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is SR 7 over Ohop Slough?

The structure is 77 ft (23.5 m) long with a longest span of 31 ft (9.4 m) and a deck 25 ft wide.

Who owns SR 7 over Ohop Slough?

It is owned by the State Highway Agency.