US Bridges

Brown Road over Manastash Creek

Good

Kittitas County, Washington · 00.76 S Thorp HWY · Structure no. 080129000000000

Built
1962
63 years old
Condition
Good
inspected October 2023
Type
Tee Beam
Concrete Continuous
Length
81 ft
1 main span
Daily traffic
675
2022 count
Owner
County
County Highway Agency

About this bridge

Brown Road over Manastash Creek is a concrete continuous tee beam carrying Brown Road over Manastash Creek in Kittitas County, Washington. It was built in 1962, so it is 63 years old, older 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 675 vehicles a day, roughly 24% of them trucks, projected to reach 1,711 by 2040. The structure is 81 ft (24.7 m) long and 27 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesBrown Road
CrossesManastash Creek
Location00.76 S Thorp HWY
RouteCounty Highway 95611
Coordinates46.99471, -120.59067
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22.5 US tons
Inventory rating17.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckOther
Main spans1 (+2 approach)
Design loadHS 20
Structure length81 ft (24.7 m)
Longest span52 ft (15.8 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic675 (2022)
Projected traffic1,711 by 2040
Trucks24%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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$3.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Brown Road over Manastash Creek built?

It was built in 1962, making it 63 years old in 2025.

What condition is Brown Road over Manastash Creek 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 Brown Road over Manastash Creek carry?

About 675 vehicles per day (2022 count), of which roughly 24% are trucks.

How long is Brown Road over Manastash Creek?

The structure is 81 ft (24.7 m) long with a longest span of 52 ft (15.8 m) and a deck 27 ft wide.

Who owns Brown Road over Manastash Creek?

It is owned by the County Highway Agency.