US Bridges

6 RD NE over Rocky Coulee

Fair

Grant County, Washington · 6 NE 0.1 W of W NE · Structure no. 079888000000000

Built
1914
111 years old
Condition
Fair
inspected December 2023
Type
Culvert
Concrete
Length
52 ft
1 main span
Daily traffic
71
2020 count
Owner
County
County Highway Agency

About this bridge

6 RD NE over Rocky Coulee is a concrete culvert carrying 6 RD NE over Rocky Coulee in Grant County, Washington. It was built in 1914, so it is 111 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 71 vehicles a day, roughly 15% of them trucks, projected to reach 137 by 2042. The structure is 52 ft (15.8 m) long and 22 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Carries6 RD NE
CrossesRocky Coulee
Location6 NE 0.1 W of W NE
RouteCounty Highway 44400
Coordinates47.1741, -119.00324
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25 US tons
Inventory rating15 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length52 ft (15.8 m)
Longest span46 ft (14 m)
Deck width22 ft (6.6 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic71 (2020)
Projected traffic137 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$100 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 6 RD NE over Rocky Coulee built?

It was built in 1914, making it 111 years old in 2025.

What condition is 6 RD NE over Rocky Coulee 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 December 2023.

How much traffic does 6 RD NE over Rocky Coulee carry?

About 71 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is 6 RD NE over Rocky Coulee?

The structure is 52 ft (15.8 m) long with a longest span of 46 ft (14 m) and a deck 22 ft wide.

Who owns 6 RD NE over Rocky Coulee?

It is owned by the County Highway Agency.