US Bridges

Nav Lock Bridge over Nav Lock Channel

Good

Garfield County, Washington · Lower Granite Dam · Structure no. CEPNPWWA0LGRNAV

Built
1982
43 years old
Condition
Good
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
90 ft
1 main span
Daily traffic
150
2022 count
Owner
Federal
Corps of Engineers (Civil)

About this bridge

Nav Lock Bridge over Nav Lock Channel is a prestressed concrete stringer/multi-beam or girder carrying Nav Lock Bridge over Nav Lock Channel in Garfield County, Washington. It was built in 1982, so it is 43 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 150 vehicles a day, roughly 5% of them trucks, projected to reach 200 by 2043. The structure is 90 ft (27.5 m) long and 29 ft wide. If it were closed, the detour would be 65.2 mi (105 km).

CarriesNav Lock Bridge
CrossesNav Lock Channel
LocationLower Granite Dam
Coordinates46.66177, -117.43089
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating92.8 US tons
Inventory rating71.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length90 ft (27.5 m)
Longest span88 ft (26.9 m)
Deck width29 ft (8.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2022)
Projected traffic200 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed65.2 mi (105 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCorps of Engineers (Civil)
Maintained byCorps of Engineers (Civil)
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$359,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nav Lock Bridge over Nav Lock Channel built?

It was built in 1982, making it 43 years old in 2025.

What condition is Nav Lock Bridge over Nav Lock Channel in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2025.

How much traffic does Nav Lock Bridge over Nav Lock Channel carry?

About 150 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Nav Lock Bridge over Nav Lock Channel?

The structure is 90 ft (27.5 m) long with a longest span of 88 ft (26.9 m) and a deck 29 ft wide.

Who owns Nav Lock Bridge over Nav Lock Channel?

It is owned by the Corps of Engineers (Civil).