US Bridges

State Route 99 over Dry Channel

Good

Butte County, California · 03-BUT-099-30.24 · Structure no. 12 0117

Built
1953
72 years old
Condition
Good
inspected May 2023
Type
Culvert
Concrete Continuous
Length
26 ft
3 main spans
Daily traffic
32,600
2020 count
Owner
State
State Highway Agency

About this bridge

State Route 99 over Dry Channel is a concrete continuous culvert carrying State Route 99 over Dry Channel in Butte County, California. It was built in 1953, so it is 72 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 32,600 vehicles a day, roughly 9% of them trucks, projected to reach 49,736 by 2041. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 5 mi (8 km).

CarriesState Route 99
CrossesDry Channel
Location03-BUT-099-30.24
RouteState Highway 99
Coordinates39.71094, -121.79653
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span8 ft (2.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,600 (2020)
Projected traffic49,736 by 2041
Trucks9%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 99 over Dry Channel built?

It was built in 1953, making it 72 years old in 2025.

What condition is State Route 99 over Dry Channel 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 May 2023.

How much traffic does State Route 99 over Dry Channel carry?

About 32,600 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is State Route 99 over Dry Channel?

The structure is 26 ft (7.9 m) long with a longest span of 8 ft (2.4 m).

Who owns State Route 99 over Dry Channel?

It is owned by the State Highway Agency.