US Bridges

SR 27 over Rock Creek

Poor

Spokane County, Washington · 0.2 N JCT SR 278 · Structure no. 0005397A0000000

Built
1957
68 years old
Condition
Poor
inspected July 2024
Type
Tee Beam
Concrete Continuous
Length
142 ft
3 main spans
Daily traffic
5,713
2023 count
Owner
State
State Highway Agency

About this bridge

SR 27 over Rock Creek is a concrete continuous tee beam carrying SR 27 over Rock Creek in Spokane County, Washington. It was built in 1957, so it is 68 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 5,713 vehicles a day, roughly 8% of them trucks, projected to reach 7,080 by 2039. The structure is 142 ft (43.3 m) long and 33 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesSR 27
CrossesRock Creek
Location0.2 N JCT SR 278
RouteState Highway 27
CountySpokane County
StateWashington
Coordinates47.45306, -117.14208
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
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 rating20 US tons
Inventory rating15.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length142 ft (43.3 m)
Longest span60 ft (18.3 m)
Deck width33 ft (10.2 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,713 (2023)
Projected traffic7,080 by 2039
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 27 over Rock Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is SR 27 over Rock Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.

How much traffic does SR 27 over Rock Creek carry?

About 5,713 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is SR 27 over Rock Creek?

The structure is 142 ft (43.3 m) long with a longest span of 60 ft (18.3 m) and a deck 33 ft wide.

Who owns SR 27 over Rock Creek?

It is owned by the State Highway Agency.