US Bridges

SE Middle Fork RD over Middle Fork Snoqualmie R

Fair

King County, Washington · 5.1 MI N of I-90 · Structure no. 085967000000000

Built
1963
62 years old
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
290 ft
3 main spans
Daily traffic
125
2018 count
Owner
County
County Highway Agency

About this bridge

SE Middle Fork RD over Middle Fork Snoqualmie R is a concrete continuous box beam or girders - multiple carrying SE Middle Fork RD over Middle Fork Snoqualmie R in King County, Washington. It was built in 1963, so it is 62 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 125 vehicles a day, roughly 2% of them trucks, projected to reach 200 by 2039. The structure is 290 ft (88.4 m) long and 31 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesSE Middle Fork RD
CrossesMiddle Fork Snoqualmie R
Location5.1 MI N of I-90
RouteCounty Highway 98990
Coordinates47.495, -121.64008
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.7 US tons
Inventory rating24.7 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length290 ft (88.4 m)
Longest span130 ft (39.6 m)
Deck width31 ft (9.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic125 (2018)
Projected traffic200 by 2039
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$4.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SE Middle Fork RD over Middle Fork Snoqualmie R built?

It was built in 1963, making it 62 years old in 2025.

What condition is SE Middle Fork RD over Middle Fork Snoqualmie R 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 July 2024.

How much traffic does SE Middle Fork RD over Middle Fork Snoqualmie R carry?

About 125 vehicles per day (2018 count), of which roughly 2% are trucks.

How long is SE Middle Fork RD over Middle Fork Snoqualmie R?

The structure is 290 ft (88.4 m) long with a longest span of 130 ft (39.6 m) and a deck 31 ft wide.

Who owns SE Middle Fork RD over Middle Fork Snoqualmie R?

It is owned by the County Highway Agency.