US Bridges

SR 121 over Blooms Ditch

Good

Thurston County, Washington · 4.0 E JCT I-5 · Structure no. 0018853B0000000

Built
2016
9 years old
Condition
Good
inspected August 2022
Type
Culvert
Concrete
Length
27 ft
1 main span
Daily traffic
2,779
2023 count
Owner
State
State Highway Agency

About this bridge

SR 121 over Blooms Ditch is a concrete culvert carrying SR 121 over Blooms Ditch in Thurston County, Washington. It was built in 2016, so it is 9 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 2,779 vehicles a day, roughly 7% of them trucks, projected to reach 4,144 by 2039. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesSR 121
CrossesBlooms Ditch
Location4.0 E JCT I-5
RouteState Highway 121
CountyThurston County
StateWashington
Coordinates46.92083, -122.90792
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert8 Very GoodNo problems noted.
Last inspectionAugust 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating42.5 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHL 93
Structure length27 ft (8.2 m)
Longest span27 ft (8.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,779 (2023)
Projected traffic4,144 by 2039
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 121 over Blooms Ditch built?

It was built in 2016, making it 9 years old in 2025.

What condition is SR 121 over Blooms Ditch 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 August 2022.

How much traffic does SR 121 over Blooms Ditch carry?

About 2,779 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is SR 121 over Blooms Ditch?

The structure is 27 ft (8.2 m) long with a longest span of 27 ft (8.2 m).

Who owns SR 121 over Blooms Ditch?

It is owned by the State Highway Agency.