US Bridges

Hahn Road over North Branch Sand Creek

Good

Colusa County, California · 0.7 MI East of Old 99 W · Structure no. 15C0078

Built
1968
57 years old
Condition
Good
inspected October 2023
Type
Slab
Concrete Continuous
Length
63 ft
2 main spans
Daily traffic
1,651
2014 count
Owner
County
County Highway Agency

About this bridge

Hahn Road over North Branch Sand Creek is a concrete continuous slab carrying Hahn Road over North Branch Sand Creek in Colusa County, California. It was built in 1968, so it is 57 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 1,651 vehicles a day, roughly 10% of them trucks, projected to reach 1,843 by 2042. The structure is 63 ft (19.2 m) long and 41 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesHahn Road
CrossesNorth Branch Sand Creek
Location0.7 MI East of Old 99 W
RouteCounty Highway 0
Coordinates39.05672, -122.07156
Functional classRural Major Collector

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 protection7 GoodSome minor problems.
Last inspectionOctober 2023
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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.3 US tons
Inventory rating41.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length63 ft (19.2 m)
Longest span30 ft (9.1 m)
Deck width41 ft (12.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,651 (2014)
Projected traffic1,843 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Hahn Road over North Branch Sand Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is Hahn Road over North Branch Sand Creek 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 October 2023.

How much traffic does Hahn Road over North Branch Sand Creek carry?

About 1,651 vehicles per day (2014 count), of which roughly 10% are trucks.

How long is Hahn Road over North Branch Sand Creek?

The structure is 63 ft (19.2 m) long with a longest span of 30 ft (9.1 m) and a deck 41 ft wide.

Who owns Hahn Road over North Branch Sand Creek?

It is owned by the County Highway Agency.