US Bridges

Brunswick Road over State Route 20

Good

Nevada County, California · 03-NEV-020-R14.80 · Structure no. 17 0048

Built
1969
56 years old, rebuilt 1988
Condition
Good
inspected July 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
186 ft
2 main spans
Daily traffic
26,000
2020 count
Owner
State
State Highway Agency

About this bridge

Brunswick Road over State Route 20 is a concrete continuous box beam or girders - multiple carrying Brunswick Road over State Route 20 in Nevada County, California. It was built in 1969 and reconstructed in 1988, so it is 56 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 26,000 vehicles a day, roughly 12% of them trucks, projected to reach 30,809 by 2041. The structure is 186 ft (56.7 m) long and 70 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesBrunswick Road
CrossesState Route 20
Location03-NEV-020-R14.80
RouteCounty Highway 0
Coordinates39.2354, -121.03702
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.
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 evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.5 US tons
Inventory rating16.1 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length186 ft (56.7 m)
Longest span92 ft (28 m)
Deck width70 ft (21.3 m)
Roadway width62 ft (18.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,000 (2020)
Projected traffic30,809 by 2041
Trucks12%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed5 mi (8 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 Brunswick Road over State Route 20 built?

It was built in 1969, making it 56 years old in 2025. It was reconstructed in 1988.

What condition is Brunswick 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 Brunswick Road over State Route 20 carry?

About 26,000 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is Brunswick Road over State Route 20?

The structure is 186 ft (56.7 m) long with a longest span of 92 ft (28 m) and a deck 70 ft wide.

Who owns Brunswick Road over State Route 20?

It is owned by the State Highway Agency.