US Bridges

Cell Phone Ramp over S 170th

Fair

King County, Washington · 1 MI S of SR 518 · Structure no. 085811000000000

Built
1972
53 years old
Condition
Fair
inspected February 2024
Type
Box Beam or Girders - Multiple
Concrete
Length
148 ft
3 main spans
Daily traffic
4,300
2021 count
Owner
Local
Other Local Agency

About this bridge

Cell Phone Ramp over S 170th is a concrete box beam or girders - multiple carrying Cell Phone Ramp over S 170th in King County, Washington. It was built in 1972, so it is 53 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 4,300 vehicles a day, roughly 1% of them trucks, projected to reach 4,300 by 2041. The structure is 148 ft (45.1 m) long and 55 ft wide.

CarriesCell Phone Ramp
CrossesS 170th
Location1 MI S of SR 518
Coordinates47.45094, -122.30025
Functional classUrban Local

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.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41.1 US tons
Inventory rating31.7 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length148 ft (45.1 m)
Longest span98 ft (29.9 m)
Deck width55 ft (16.9 m)
Roadway width52 ft (15.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,300 (2021)
Projected traffic4,300 by 2041
Trucks1%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$4.1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Cell Phone Ramp over S 170th built?

It was built in 1972, making it 53 years old in 2025.

What condition is Cell Phone Ramp over S 170th 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 February 2024.

How much traffic does Cell Phone Ramp over S 170th carry?

About 4,300 vehicles per day (2021 count), of which roughly 1% are trucks.

How long is Cell Phone Ramp over S 170th?

The structure is 148 ft (45.1 m) long with a longest span of 98 ft (29.9 m) and a deck 55 ft wide.

Who owns Cell Phone Ramp over S 170th?

It is owned by the Other Local Agency.