US Bridges

S 116th ST over Drainage Ditch-Relief

Good

King County, Washington · 0.3 MI W of SR-99 · Structure no. 089193000000000

Built
2020
5 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
175 ft
1 main span
Daily traffic
6,500
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

S 116th ST over Drainage Ditch-Relief is a concrete stringer/multi-beam or girder carrying S 116th ST over Drainage Ditch-Relief in King County, Washington. It was built in 2020, so it is 5 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,500 vehicles a day, roughly 5% of them trucks, projected to reach 7,200 by 2041. The structure is 175 ft (53.3 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesS 116th ST
CrossesDrainage Ditch-Relief
Location0.3 MI W of SR-99
RouteCity Street 1372
Coordinates47.4993, -122.30407
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation8: Equal to present desirable criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79.7 US tons
Inventory rating50.4 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length175 ft (53.3 m)
Longest span170 ft (51.8 m)
Deck width39 ft (11.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,500 (2021)
Projected traffic7,200 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$2.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S 116th ST over Drainage Ditch-Relief built?

It was built in 2020, making it 5 years old in 2025.

What condition is S 116th ST over Drainage Ditch-Relief in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does S 116th ST over Drainage Ditch-Relief carry?

About 6,500 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is S 116th ST over Drainage Ditch-Relief?

The structure is 175 ft (53.3 m) long with a longest span of 170 ft (51.8 m) and a deck 39 ft wide.

Who owns S 116th ST over Drainage Ditch-Relief?

It is owned by the City or Municipal Highway Agency.