US Bridges

N Liberty Lake RD over I-90

Fair

Spokane County, Washington · 6.3 E JCT SR 27 · Structure no. 0007423A0000000

Built
1964
61 years old, rebuilt 2020
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
215 ft
4 main spans
Daily traffic
13,929
2016 count
Owner
State
State Highway Agency

About this bridge

N Liberty Lake RD over I-90 is a prestressed concrete stringer/multi-beam or girder carrying N Liberty Lake RD over I-90 in Spokane County, Washington. It was built in 1964 and reconstructed in 2020, so it is 61 years old, older 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 13,929 vehicles a day, roughly 5% of them trucks, projected to reach 19,077 by 2038. The structure is 215 ft (65.5 m) long and 45 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesN Liberty Lake RD
CrossesI-90
Location6.3 E JCT SR 27
RouteCounty Highway 0
CountySpokane County
StateWashington
Coordinates47.67244, -117.10835
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length215 ft (65.5 m)
Longest span58 ft (17.7 m)
Deck width45 ft (13.7 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,929 (2016)
Projected traffic19,077 by 2038
Trucks5%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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$4.1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was N Liberty Lake RD over I-90 built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2020.

What condition is N Liberty Lake RD over I-90 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 May 2023.

How much traffic does N Liberty Lake RD over I-90 carry?

About 13,929 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is N Liberty Lake RD over I-90?

The structure is 215 ft (65.5 m) long with a longest span of 58 ft (17.7 m) and a deck 45 ft wide.

Who owns N Liberty Lake RD over I-90?

It is owned by the State Highway Agency.