US Bridges

SR 7 over Mashel River

Fair

Pierce County, Washington · 1.0 N JCT SR 161 · Structure no. 0003404A0000000

Built
1948
77 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
195 ft
3 main spans
Daily traffic
1,758
2023 count
Owner
State
State Highway Agency

About this bridge

SR 7 over Mashel River is a steel stringer/multi-beam or girder carrying SR 7 over Mashel River in Pierce County, Washington. It was built in 1948, so it is 77 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 1,758 vehicles a day, roughly 10% of them trucks, projected to reach 2,450 by 2039. The structure is 195 ft (59.4 m) long and 26 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSR 7
CrossesMashel River
Location1.0 N JCT SR 161
RouteState Highway 7
CountyPierce County
StateWashington
Coordinates46.85597, -122.30294
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating55 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length195 ft (59.4 m)
Longest span108 ft (32.9 m)
Deck width26 ft (7.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,758 (2023)
Projected traffic2,450 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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$2.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 7 over Mashel River built?

It was built in 1948, making it 77 years old in 2025.

What condition is SR 7 over Mashel River 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 7 over Mashel River carry?

About 1,758 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SR 7 over Mashel River?

The structure is 195 ft (59.4 m) long with a longest span of 108 ft (32.9 m) and a deck 26 ft wide.

Who owns SR 7 over Mashel River?

It is owned by the State Highway Agency.