US Bridges

Oroville Quincy Hy over Lake Madrone Spillway

Fair

Butte County, California · At Lake Madrone · Structure no. 12C0006

Built
1930
95 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete Continuous
Length
31 ft
3 main spans
Daily traffic
542
2019 count
Owner
County
County Highway Agency

About this bridge

Oroville Quincy Hy over Lake Madrone Spillway is a concrete continuous culvert carrying Oroville Quincy Hy over Lake Madrone Spillway in Butte County, California. It was built in 1930, so it is 95 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 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 542 vehicles a day, roughly 10% of them trucks, projected to reach 320 by 2042. The structure is 31 ft (9.4 m) long and 21 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

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CarriesOroville Quincy Hy
CrossesLake Madrone Spillway
LocationAt Lake Madrone
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates39.64971, -121.40934
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
Channel and channel protection9 ExcellentNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating29.7 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadUnknown
Structure length31 ft (9.4 m)
Longest span10 ft (3 m)
Deck width21 ft (6.4 m)
Roadway width18 ft (5.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic542 (2019)
Projected traffic320 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Oroville Quincy Hy over Lake Madrone Spillway built?

It was built in 1930, making it 95 years old in 2025.

What condition is Oroville Quincy Hy over Lake Madrone Spillway 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 November 2023.

How much traffic does Oroville Quincy Hy over Lake Madrone Spillway carry?

About 542 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is Oroville Quincy Hy over Lake Madrone Spillway?

The structure is 31 ft (9.4 m) long with a longest span of 10 ft (3 m) and a deck 21 ft wide.

Who owns Oroville Quincy Hy over Lake Madrone Spillway?

It is owned by the County Highway Agency.