US Bridges

Comstock Drive over Drainage Ditch

Fair

Nevada County, California · South of Granite Drive · Structure no. 17C0100

Built
2003
22 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
27 ft
1 main span
Daily traffic
2,000
2013 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Comstock Drive over Drainage Ditch is a steel stringer/multi-beam or girder carrying Comstock Drive over Drainage Ditch in Nevada County, California. It was built in 2003, so it is 22 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 2,000 vehicles a day, roughly 2% of them trucks, projected to reach 5,204 by 2042. The structure is 27 ft (8.3 m) long and 41 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesComstock Drive
CrossesDrainage Ditch
LocationSouth of Granite Drive
RouteCity Street 0
CountyNevada County
StateCalifornia
Coordinates39.33887, -120.18269
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.9 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length27 ft (8.3 m)
Longest span26 ft (7.9 m)
Deck width41 ft (12.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2013)
Projected traffic5,204 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Comstock Drive over Drainage Ditch built?

It was built in 2003, making it 22 years old in 2025.

What condition is Comstock Drive over Drainage Ditch in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2024.

How much traffic does Comstock Drive over Drainage Ditch carry?

About 2,000 vehicles per day (2013 count), of which roughly 2% are trucks.

How long is Comstock Drive over Drainage Ditch?

The structure is 27 ft (8.3 m) long with a longest span of 26 ft (7.9 m) and a deck 41 ft wide.

Who owns Comstock Drive over Drainage Ditch?

It is owned by the Town or Township Highway Agency.