US Bridges

Knoxv-Berryessa RD over Putah Crk(lk Berryessa)

Fair

Napa County, California · 1 MI N/O Pope Canyon RD · Structure no. 21C0014

Built
1957
68 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
819 ft
6 main spans
Daily traffic
530
2014 count
Owner
County
County Highway Agency

About this bridge

Knoxv-Berryessa RD over Putah Crk(lk Berryessa) is a steel stringer/multi-beam or girder carrying Knoxv-Berryessa RD over Putah Crk(lk Berryessa) in Napa County, California. It was built in 1957, so it is 68 years old, older 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 5 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 530 vehicles a day, roughly 10% of them trucks, projected to reach 722 by 2040. The structure is 819 ft (249.5 m) long and 30 ft wide. If it were closed, the detour would be 80.2 mi (129 km).

Location

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CarriesKnoxv-Berryessa RD
CrossesPutah Crk(lk Berryessa)
Location1 MI N/O Pope Canyon RD
RouteCounty Highway 0
CountyNapa County
StateCalifornia
Coordinates38.6309, -122.2901
Functional classRural Major 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.4 US tons
Inventory rating51.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length819 ft (249.5 m)
Longest span166 ft (50.6 m)
Deck width30 ft (9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic530 (2014)
Projected traffic722 by 2040
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed80.2 mi (129 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Knoxv-Berryessa RD over Putah Crk(lk Berryessa) built?

It was built in 1957, making it 68 years old in 2025.

What condition is Knoxv-Berryessa RD over Putah Crk(lk Berryessa) 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 May 2023.

How much traffic does Knoxv-Berryessa RD over Putah Crk(lk Berryessa) carry?

About 530 vehicles per day (2014 count), of which roughly 10% are trucks.

How long is Knoxv-Berryessa RD over Putah Crk(lk Berryessa)?

The structure is 819 ft (249.5 m) long with a longest span of 166 ft (50.6 m) and a deck 30 ft wide.

Who owns Knoxv-Berryessa RD over Putah Crk(lk Berryessa)?

It is owned by the County Highway Agency.