US Bridges

Gail Ave (old 99W) over Salt Creek

Fair

Colusa County, California · 0.1 MI N of Grimes RD · Structure no. 15C0032

Built
1967
58 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete Continuous
Length
82 ft
4 main spans
Daily traffic
5,151
2014 count
Owner
County
County Highway Agency

About this bridge

Gail Ave (old 99W) over Salt Creek is a concrete continuous slab carrying Gail Ave (old 99W) over Salt Creek in Colusa County, California. It was built in 1967, so it is 58 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 5,151 vehicles a day, roughly 10% of them trucks, projected to reach 5,024 by 2042. The structure is 82 ft (25 m) long and 42 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

CarriesGail Ave (old 99W)
CrossesSalt Creek
Location0.1 MI N of Grimes RD
RouteCounty Highway 0
Coordinates39.02836, -122.06394
Functional classRural Minor 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.7 US tons
Inventory rating39.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length82 ft (25 m)
Longest span23 ft (7 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,151 (2014)
Projected traffic5,024 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5.6 mi (9 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 Gail Ave (old 99W) over Salt Creek built?

It was built in 1967, making it 58 years old in 2025.

What condition is Gail Ave (old 99W) over Salt Creek 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 October 2023.

How much traffic does Gail Ave (old 99W) over Salt Creek carry?

About 5,151 vehicles per day (2014 count), of which roughly 10% are trucks.

How long is Gail Ave (old 99W) over Salt Creek?

The structure is 82 ft (25 m) long with a longest span of 23 ft (7 m) and a deck 42 ft wide.

Who owns Gail Ave (old 99W) over Salt Creek?

It is owned by the County Highway Agency.