US Bridges

Railroad Avenue over Mercer Creek

Fair

Kittitas County, Washington · RR Ave & Mercer CR · Structure no. 085927000000000

Built
1979
46 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
29 ft
1 main span
Daily traffic
2,710
2018 count
Owner
City
City or Municipal Highway Agency

About this bridge

Railroad Avenue over Mercer Creek is a prestressed concrete stringer/multi-beam or girder carrying Railroad Avenue over Mercer Creek in Kittitas 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 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 2,710 vehicles a day, roughly 5% of them trucks, projected to reach 4,027 by 2038. The structure is 29 ft (8.8 m) long and 41 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesRailroad Avenue
CrossesMercer Creek
LocationRR Ave & Mercer CR
RouteCity Street 380
CountyKittitas County
StateWashington
Coordinates46.99253, -120.55628
Functional classUrban Minor 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.3 US tons
Inventory rating24.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length29 ft (8.8 m)
Longest span28 ft (8.5 m)
Deck width41 ft (12.5 m)
Roadway width34 ft (10.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,710 (2018)
Projected traffic4,027 by 2038
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$441,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Railroad Avenue over Mercer Creek built?

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

What condition is Railroad Avenue over Mercer Creek 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 March 2024.

How much traffic does Railroad Avenue over Mercer Creek carry?

About 2,710 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is Railroad Avenue over Mercer Creek?

The structure is 29 ft (8.8 m) long with a longest span of 28 ft (8.5 m) and a deck 41 ft wide.

Who owns Railroad Avenue over Mercer Creek?

It is owned by the City or Municipal Highway Agency.