US Bridges

Northwest Blvd over Cso Tank #6 Shadle Bluff

Good

Spokane County, Washington · Nwblvd · Structure no. 088796000000000

Built
2015
10 years old
Condition
Good
inspected July 2024
Type
Culvert
Concrete Continuous
Length
143 ft
3 main spans
Daily traffic
11,844
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Northwest Blvd over Cso Tank #6 Shadle Bluff is a concrete continuous culvert carrying Northwest Blvd over Cso Tank #6 Shadle Bluff in Spokane County, Washington. It was built in 2015, so it is 10 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 11,844 vehicles a day, roughly 1% of them trucks, projected to reach 22,000 by 2037. The structure is 143 ft (43.6 m) long.

CarriesNorthwest Blvd
CrossesCso Tank #6 Shadle Bluff
LocationNwblvd
RouteCity Street 3871
Coordinates47.69233, -117.4656
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Culvert7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating106.8 US tons
Inventory rating103.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHL 93
Structure length143 ft (43.6 m)
Longest span42 ft (12.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,844 (2022)
Projected traffic22,000 by 2037
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesOther
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$3.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Northwest Blvd over Cso Tank #6 Shadle Bluff built?

It was built in 2015, making it 10 years old in 2025.

What condition is Northwest Blvd over Cso Tank #6 Shadle Bluff 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 July 2024.

How much traffic does Northwest Blvd over Cso Tank #6 Shadle Bluff carry?

About 11,844 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Northwest Blvd over Cso Tank #6 Shadle Bluff?

The structure is 143 ft (43.6 m) long with a longest span of 42 ft (12.7 m).

Who owns Northwest Blvd over Cso Tank #6 Shadle Bluff?

It is owned by the City or Municipal Highway Agency and maintained by the Other Local Agency.