US Bridges

State Route 20 over Rex Reservoir Road

Good

Nevada County, California · 03-NEV-020-R8.44 · Structure no. 17 0096

Built
1984
41 years old
Condition
Good
inspected June 2022
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
79 ft
1 main span
Daily traffic
16,500
2020 count
Owner
State
State Highway Agency

About this bridge

State Route 20 over Rex Reservoir Road is a prestressed concrete box beam or girders - multiple carrying State Route 20 over Rex Reservoir Road in Nevada County, California. It was built in 1984, so it is 41 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 16,500 vehicles a day, projected to reach 32,863 by 2041. The structure is 79 ft (24.1 m) long and 52 ft wide. If it were closed, the detour would be 13 mi (21 km).

CarriesState Route 20
CrossesRex Reservoir Road
Location03-NEV-020-R8.44
RouteState Highway 20
Coordinates39.20899, -121.13662
Functional classRural Principal Arterial - Other

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.
Last inspectionJune 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.5 US tons
Inventory rating33.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length79 ft (24.1 m)
Longest span77 ft (23.6 m)
Deck width52 ft (15.7 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,500 (2020)
Projected traffic32,863 by 2041
Trucks0%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 20 over Rex Reservoir Road built?

It was built in 1984, making it 41 years old in 2025.

What condition is State Route 20 over Rex Reservoir Road 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 June 2022.

How much traffic does State Route 20 over Rex Reservoir Road carry?

About 16,500 vehicles per day (2020 count).

How long is State Route 20 over Rex Reservoir Road?

The structure is 79 ft (24.1 m) long with a longest span of 77 ft (23.6 m) and a deck 52 ft wide.

Who owns State Route 20 over Rex Reservoir Road?

It is owned by the State Highway Agency.