US Bridges

SR 121 over Beaver Creek

GoodPosted for load

Thurston County, Washington · 0.2 E JCT I-5 · Structure no. 080255000000000

Built
1955
70 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
62 ft
2 main spans
Daily traffic
2,367
2023 count
Owner
State
State Highway Agency

About this bridge

SR 121 over Beaver Creek is a steel stringer/multi-beam or girder carrying SR 121 over Beaver Creek in Thurston County, Washington. It was built in 1955, so it is 70 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. Its operating status is: posted for load restriction.

It carries about 2,367 vehicles a day, roughly 12% of them trucks, projected to reach 3,262 by 2039. The structure is 62 ft (18.9 m) long and 25 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesSR 121
CrossesBeaver Creek
Location0.2 E JCT I-5
RouteState Highway 121
CountyThurston County
StateWashington
Coordinates46.89644, -122.95589
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum 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 rating44 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 15
Structure length62 ft (18.9 m)
Longest span30 ft (9.1 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,367 (2023)
Projected traffic3,262 by 2039
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$884,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 121 over Beaver Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is SR 121 over Beaver Creek 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 2023.

How much traffic does SR 121 over Beaver Creek carry?

About 2,367 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is SR 121 over Beaver Creek?

The structure is 62 ft (18.9 m) long with a longest span of 30 ft (9.1 m) and a deck 25 ft wide.

Who owns SR 121 over Beaver Creek?

It is owned by the State Highway Agency.