US Bridges

SR 161 over Ohop Creek

Fair

Pierce County, Washington · 4.3 N JCT SR 7 · Structure no. 000000BG0000000

Built
1900
125 years old
Condition
Fair
inspected September 2023
Type
Tee Beam
Concrete Continuous
Length
56 ft
1 main span
Daily traffic
7,615
2023 count
Owner
State
State Highway Agency

About this bridge

SR 161 over Ohop Creek is a concrete continuous tee beam carrying SR 161 over Ohop Creek in Pierce County, Washington. It was built in 1900, so it is 125 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 7,615 vehicles a day, roughly 10% of them trucks, projected to reach 11,863 by 2039. The structure is 56 ft (17.1 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSR 161
CrossesOhop Creek
Location4.3 N JCT SR 7
RouteState Highway 161
CountyPierce County
StateWashington
Coordinates46.87642, -122.28175
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33 US tons
Inventory rating20 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadH 15
Structure length56 ft (17.1 m)
Longest span45 ft (13.7 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,615 (2023)
Projected traffic11,863 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$878,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 161 over Ohop Creek built?

It was built in 1900, making it 125 years old in 2025.

What condition is SR 161 over Ohop 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 2023.

How much traffic does SR 161 over Ohop Creek carry?

About 7,615 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SR 161 over Ohop Creek?

The structure is 56 ft (17.1 m) long with a longest span of 45 ft (13.7 m) and a deck 32 ft wide.

Who owns SR 161 over Ohop Creek?

It is owned by the State Highway Agency.