US Bridges

Little Naches Road over Quartz Creek

Fair

Kittitas County, Washington · 3.1 Mi. NW HWY 410 · Structure no. 061708000001523

Built
1972
53 years old, rebuilt 1994
Condition
Fair
inspected June 2023
Type
Frame
Concrete Continuous
Length
80 ft
3 main spans
Daily traffic
100
1991 count
Owner
Federal
U.S. Forest Service

About this bridge

Little Naches Road over Quartz Creek is a concrete continuous frame carrying Little Naches Road over Quartz Creek in Kittitas County, Washington. It was built in 1972 and reconstructed in 1994, so it is 53 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 150 by 2045. The structure is 80 ft (24.4 m) long and 39 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesLittle Naches Road
CrossesQuartz Creek
Location3.1 Mi. NW HWY 410
RouteFederal Lands Road 19000
Coordinates47.01694, -121.13528
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating38.8 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadOther
Structure length80 ft (24.4 m)
Longest span55 ft (16.8 m)
Deck width39 ft (11.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (1991)
Projected traffic150 by 2045
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$4,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Little Naches Road over Quartz Creek built?

It was built in 1972, making it 53 years old in 2025. It was reconstructed in 1994.

What condition is Little Naches Road over Quartz Creek 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 June 2023.

How much traffic does Little Naches Road over Quartz Creek carry?

About 100 vehicles per day (1991 count), of which roughly 10% are trucks.

How long is Little Naches Road over Quartz Creek?

The structure is 80 ft (24.4 m) long with a longest span of 55 ft (16.8 m) and a deck 39 ft wide.

Who owns Little Naches Road over Quartz Creek?

It is owned by the U.S. Forest Service.