US Bridges

IDAHO-MARYLAND-E20 over Idaho-Maryland Road

Good

Nevada County, California · 03-NEV-020-R13.61-GVY · Structure no. 17 0079S

Built
1969
56 years old
Condition
Good
inspected June 2022
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
167 ft
3 main spans
Daily traffic
1,200
2020 count
Owner
State
State Highway Agency

About this bridge

IDAHO-MARYLAND-E20 over Idaho-Maryland Road is a concrete continuous box beam or girders - multiple carrying IDAHO-MARYLAND-E20 over Idaho-Maryland Road in Nevada County, California. It was built in 1969, 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 1,200 vehicles a day, roughly 9% of them trucks, projected to reach 2,567 by 2042. The structure is 167 ft (50.9 m) long and 27 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesIDAHO-MARYLAND-E20
CrossesIdaho-Maryland Road
Location03-NEV-020-R13.61-GVY
RouteState Highway 20
CountyNevada County
StateCalifornia
Coordinates39.22251, -121.05077
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating37.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length167 ft (50.9 m)
Longest span72 ft (21.9 m)
Deck width27 ft (8.1 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2020)
Projected traffic2,567 by 2042
Trucks9%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 IDAHO-MARYLAND-E20 over Idaho-Maryland Road built?

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

What condition is IDAHO-MARYLAND-E20 over Idaho-Maryland 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 IDAHO-MARYLAND-E20 over Idaho-Maryland Road carry?

About 1,200 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is IDAHO-MARYLAND-E20 over Idaho-Maryland Road?

The structure is 167 ft (50.9 m) long with a longest span of 72 ft (21.9 m) and a deck 27 ft wide.

Who owns IDAHO-MARYLAND-E20 over Idaho-Maryland Road?

It is owned by the State Highway Agency.