US Bridges

Old HWY 99W over Glenn-Colusa Canal

Fair

Glenn County, California · 0.9 MI S of S.H. 162 · Structure no. 11C0186

Built
1925
100 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete Continuous
Length
53 ft
6 main spans
Daily traffic
1,452
2011 count
Owner
City
City or Municipal Highway Agency

About this bridge

Old HWY 99W over Glenn-Colusa Canal is a concrete continuous culvert carrying Old HWY 99W over Glenn-Colusa Canal in Glenn County, California. It was built in 1925, so it is 100 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 1,452 vehicles a day, roughly 25% of them trucks, projected to reach 4,081 by 2043. The structure is 53 ft (16.2 m) long and 41 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesOld HWY 99W
CrossesGlenn-Colusa Canal
Location0.9 MI S of S.H. 162
RouteCity Street 0
CountyGlenn County
StateCalifornia
Coordinates39.51141, -122.1938
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 protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating28.2 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadUnknown
Structure length53 ft (16.2 m)
Longest span9 ft (2.7 m)
Deck width41 ft (12.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,452 (2011)
Projected traffic4,081 by 2043
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Old HWY 99W over Glenn-Colusa Canal built?

It was built in 1925, making it 100 years old in 2025.

What condition is Old HWY 99W over Glenn-Colusa Canal 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 January 2025.

How much traffic does Old HWY 99W over Glenn-Colusa Canal carry?

About 1,452 vehicles per day (2011 count), of which roughly 25% are trucks.

How long is Old HWY 99W over Glenn-Colusa Canal?

The structure is 53 ft (16.2 m) long with a longest span of 9 ft (2.7 m) and a deck 41 ft wide.

Who owns Old HWY 99W over Glenn-Colusa Canal?

It is owned by the City or Municipal Highway Agency.