US Bridges

SR 21 over Intermittent Stream

Fair

Adams County, Washington · 2.9 N Franklin CO · Structure no. 000000QR0000000

Built
1981
44 years old
Condition
Fair
inspected February 2024
Type
Channel Beam
Prestressed Concrete
Length
42 ft
1 main span
Daily traffic
165
2023 count
Owner
State
State Highway Agency

About this bridge

SR 21 over Intermittent Stream is a prestressed concrete channel beam carrying SR 21 over Intermittent Stream in Adams County, Washington. It was built in 1981, so it is 44 years old, younger 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 165 vehicles a day, roughly 35% of them trucks, projected to reach 185 by 2039. The structure is 42 ft (12.8 m) long and 32 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesSR 21
CrossesIntermittent Stream
Location2.9 N Franklin CO
RouteState Highway 21
CountyAdams County
StateWashington
Coordinates46.77753, -118.54739
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating39 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadH 20
Structure length42 ft (12.8 m)
Longest span42 ft (12.8 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic165 (2023)
Projected traffic185 by 2039
Trucks35%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$678,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 21 over Intermittent Stream built?

It was built in 1981, making it 44 years old in 2025.

What condition is SR 21 over Intermittent Stream 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 February 2024.

How much traffic does SR 21 over Intermittent Stream carry?

About 165 vehicles per day (2023 count), of which roughly 35% are trucks.

How long is SR 21 over Intermittent Stream?

The structure is 42 ft (12.8 m) long with a longest span of 42 ft (12.8 m) and a deck 32 ft wide.

Who owns SR 21 over Intermittent Stream?

It is owned by the State Highway Agency.