US Bridges

W-Ne over Blackrock Coulee

Good

Grant County, Washington · W NE 0.2 S of 16 · Structure no. 087117000000000

Built
2003
22 years old
Condition
Good
inspected October 2023
Type
Culvert
Steel
Length
24 ft
3 main spans
Daily traffic
235
2020 count
Owner
County
County Highway Agency

About this bridge

W-Ne over Blackrock Coulee is a steel culvert carrying W-Ne over Blackrock Coulee in Grant County, Washington. It was built in 2003, so it is 22 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 235 vehicles a day, roughly 40% of them trucks, projected to reach 325 by 2043. The structure is 24 ft (7.3 m) long and 32 ft wide. If it were closed, the detour would be 23 mi (37 km).

Location

Open in Google Maps
CarriesW-Ne
CrossesBlackrock Coulee
LocationW NE 0.2 S of 16
RouteCounty Highway 95035
CountyGrant County
StateWashington
Coordinates47.31736, -119.00031
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating48.2 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadHS 25 or greater
Structure length24 ft (7.3 m)
Longest span6 ft (1.8 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic235 (2020)
Projected traffic325 by 2043
Trucks40%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed23 mi (37 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$342,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was W-Ne over Blackrock Coulee built?

It was built in 2003, making it 22 years old in 2025.

What condition is W-Ne over Blackrock Coulee 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 October 2023.

How much traffic does W-Ne over Blackrock Coulee carry?

About 235 vehicles per day (2020 count), of which roughly 40% are trucks.

How long is W-Ne over Blackrock Coulee?

The structure is 24 ft (7.3 m) long with a longest span of 6 ft (1.8 m) and a deck 32 ft wide.

Who owns W-Ne over Blackrock Coulee?

It is owned by the County Highway Agency.