US Bridges

Dillard RD over Cosumnes River

Good

Sacramento County, California · 0.2 MI S of S.R. 16 · Structure no. 24C0004

Built
1964
61 years old
Condition
Good
inspected April 2023
Type
Tee Beam
Concrete Continuous
Length
350 ft
5 main spans
Daily traffic
3,921
2014 count
Owner
County
County Highway Agency

About this bridge

Dillard RD over Cosumnes River is a concrete continuous tee beam carrying Dillard RD over Cosumnes River in Sacramento County, California. It was built in 1964, so it is 61 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 3,921 vehicles a day, roughly 10% of them trucks, projected to reach 6,349 by 2043. The structure is 350 ft (106.7 m) long and 34 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesDillard RD
CrossesCosumnes River
Location0.2 MI S of S.R. 16
RouteCounty Highway 0
Coordinates38.4909, -121.16164
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating20.7 US tons
Inventory rating14.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length350 ft (106.7 m)
Longest span82 ft (25 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,921 (2014)
Projected traffic6,349 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Dillard RD over Cosumnes River built?

It was built in 1964, making it 61 years old in 2025.

What condition is Dillard RD over Cosumnes River 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 April 2023.

How much traffic does Dillard RD over Cosumnes River carry?

About 3,921 vehicles per day (2014 count), of which roughly 10% are trucks.

How long is Dillard RD over Cosumnes River?

The structure is 350 ft (106.7 m) long with a longest span of 82 ft (25 m) and a deck 34 ft wide.

Who owns Dillard RD over Cosumnes River?

It is owned by the County Highway Agency.