US Bridges

Armstrong Road over Brushy Creek

Good

Contra Costa County, California · 0.3 MI W Byron Hot Spring · Structure no. 28C0481

Built
1998
27 years old
Condition
Good
inspected July 2024
Type
Culvert
Concrete Continuous
Length
33 ft
4 main spans
Daily traffic
380
2013 count
Owner
County
County Highway Agency

About this bridge

Armstrong Road over Brushy Creek is a concrete continuous culvert carrying Armstrong Road over Brushy Creek in Contra Costa County, California. It was built in 1998, so it is 27 years old, younger than the California average of 54.8 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 380 vehicles a day, roughly 3% of them trucks, projected to reach 515 by 2046. The structure is 33 ft (10 m) long and 50 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesArmstrong Road
CrossesBrushy Creek
Location0.3 MI W Byron Hot Spring
RouteCounty Highway 0
Coordinates37.83831, -121.62935
Functional classRural Local

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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans4
Design loadHS 20 + Mod
Structure length33 ft (10 m)
Longest span8 ft (2.4 m)
Deck width50 ft (15.2 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic380 (2013)
Projected traffic515 by 2046
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Armstrong Road over Brushy Creek built?

It was built in 1998, making it 27 years old in 2025.

What condition is Armstrong Road over Brushy 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 July 2024.

How much traffic does Armstrong Road over Brushy Creek carry?

About 380 vehicles per day (2013 count), of which roughly 3% are trucks.

How long is Armstrong Road over Brushy Creek?

The structure is 33 ft (10 m) long with a longest span of 8 ft (2.4 m) and a deck 50 ft wide.

Who owns Armstrong Road over Brushy Creek?

It is owned by the County Highway Agency.