US Bridges

Gold Flat Road over State Route 20

Good

Nevada County, California · 03-NEV-020-R15.92 · Structure no. 17 0082

Built
1967
58 years old
Condition
Good
inspected July 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
162 ft
2 main spans
Daily traffic
20,000
2020 count
Owner
State
State Highway Agency

About this bridge

Gold Flat Road over State Route 20 is a concrete continuous box beam or girders - multiple carrying Gold Flat Road over State Route 20 in Nevada County, California. It was built in 1967, so it is 58 years old, older 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 20,000 vehicles a day, roughly 10% of them trucks, projected to reach 31,222 by 2042. The structure is 162 ft (49.4 m) long and 37 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesGold Flat Road
CrossesState Route 20
Location03-NEV-020-R15.92
RouteCounty Highway 0
Coordinates39.24826, -121.02499
Functional classRural Minor 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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating31.4 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length162 ft (49.4 m)
Longest span84 ft (25.6 m)
Deck width37 ft (11.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,000 (2020)
Projected traffic31,222 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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 Gold Flat Road over State Route 20 built?

It was built in 1967, making it 58 years old in 2025.

What condition is Gold Flat Road over State Route 20 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 Gold Flat Road over State Route 20 carry?

About 20,000 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Gold Flat Road over State Route 20?

The structure is 162 ft (49.4 m) long with a longest span of 84 ft (25.6 m) and a deck 37 ft wide.

Who owns Gold Flat Road over State Route 20?

It is owned by the State Highway Agency.