US Bridges

Terrace Heights DR over 18th Street

FairPosted for load

Yakima County, Washington · 00.04 E of N18th ST · Structure no. 082731000000000

Built
1979
46 years old
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
41 ft
1 main span
Daily traffic
28,500
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Terrace Heights DR over 18th Street is a prestressed concrete stringer/multi-beam or girder carrying Terrace Heights DR over 18th Street in Yakima County, Washington. It was built in 1979, so it is 46 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 28,500 vehicles a day, roughly 30% of them trucks, projected to reach 29,118 by 2043. The structure is 41 ft (12.5 m) long and 66 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesTerrace Heights DR
Crosses18th Street
Location00.04 E of N18th ST
RouteCity Street 4050
CountyYakima County
StateWashington
Coordinates46.605, -120.47833
Functional classUrban Other Principal Arterial

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating19.3 US tons
Inventory rating15.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length41 ft (12.5 m)
Longest span40 ft (12.2 m)
Deck width66 ft (20.1 m)
Roadway width53 ft (16.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,500 (2023)
Projected traffic29,118 by 2043
Trucks30%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Terrace Heights DR over 18th Street built?

It was built in 1979, making it 46 years old in 2025.

What condition is Terrace Heights DR over 18th Street 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 January 2023.

How much traffic does Terrace Heights DR over 18th Street carry?

About 28,500 vehicles per day (2023 count), of which roughly 30% are trucks.

How long is Terrace Heights DR over 18th Street?

The structure is 41 ft (12.5 m) long with a longest span of 40 ft (12.2 m) and a deck 66 ft wide.

Who owns Terrace Heights DR over 18th Street?

It is owned by the City or Municipal Highway Agency.