US Bridges

428th Ave SE over N Fk Snoqualmie R

PoorPosted for load

King County, Washington · 2.4 MI E of SR 202 · Structure no. 084612000000000

Built
1951
74 years old
Condition
Poor
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
252 ft
1 main span
Daily traffic
1,200
2020 count
Owner
County
County Highway Agency

About this bridge

428th Ave SE over N Fk Snoqualmie R is a steel stringer/multi-beam or girder carrying 428th Ave SE over N Fk Snoqualmie R in King County, Washington. It was built in 1951, so it is 74 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 1,200 vehicles a day, roughly 5% of them trucks, projected to reach 1,650 by 2040. The structure is 252 ft (76.8 m) long and 27 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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Carries428th Ave SE
CrossesN Fk Snoqualmie R
Location2.4 MI E of SR 202
RouteCounty Highway 87150
CountyKing County
StateWashington
Coordinates47.5216, -121.76956
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

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.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating15.3 US tons
Inventory rating11.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 15
Structure length252 ft (76.8 m)
Longest span115 ft (35.1 m)
Deck width27 ft (8.1 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2020)
Projected traffic1,650 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$9.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 428th Ave SE over N Fk Snoqualmie R built?

It was built in 1951, making it 74 years old in 2025.

What condition is 428th Ave SE over N Fk Snoqualmie R in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2023.

How much traffic does 428th Ave SE over N Fk Snoqualmie R carry?

About 1,200 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is 428th Ave SE over N Fk Snoqualmie R?

The structure is 252 ft (76.8 m) long with a longest span of 115 ft (35.1 m) and a deck 27 ft wide.

Who owns 428th Ave SE over N Fk Snoqualmie R?

It is owned by the County Highway Agency.