US Bridges

Kowolski Road over Clear Lake Dam Spillway

Good

Modoc County, California · 40 MI SE of Klamath Falls · Structure no. KLAM-001

Built
1999
26 years old, rebuilt 2001
Condition
Good
inspected January 2021
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
101 ft
1 main span
Daily traffic
1
2007 count
Owner
Federal
Bureau of Reclamation

About this bridge

Kowolski Road over Clear Lake Dam Spillway is a prestressed concrete box beam or girders - multiple carrying Kowolski Road over Clear Lake Dam Spillway in Modoc County, California. It was built in 1999 and reconstructed in 2001, so it is 26 years old, younger 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 vehicles a day, projected to reach 1 by 2037. The structure is 101 ft (30.8 m) long and 16 ft wide.

Location

Open in Google Maps
CarriesKowolski Road
CrossesClear Lake Dam Spillway
Location40 MI SE of Klamath Falls
CountyModoc County
StateCalifornia
Coordinates41.92653, -121.07608
Functional classRural Local

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.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJanuary 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51.5 US tons
Inventory rating39.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length101 ft (30.8 m)
Longest span99 ft (30.3 m)
Deck width16 ft (4.9 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1 (2007)
Projected traffic1 by 2037
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Reclamation
Maintained byBureau of Reclamation
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$1,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Kowolski Road over Clear Lake Dam Spillway built?

It was built in 1999, making it 26 years old in 2025. It was reconstructed in 2001.

What condition is Kowolski Road over Clear Lake Dam Spillway 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 January 2021.

How much traffic does Kowolski Road over Clear Lake Dam Spillway carry?

About 1 vehicles per day (2007 count).

How long is Kowolski Road over Clear Lake Dam Spillway?

The structure is 101 ft (30.8 m) long with a longest span of 99 ft (30.3 m) and a deck 16 ft wide.

Who owns Kowolski Road over Clear Lake Dam Spillway?

It is owned by the Bureau of Reclamation.