US Bridges

Alta Mesa Road over Laguna Creek

Poor

Sacramento County, California · 0.4 MI N of SR 104 · Structure no. 24C0306

Built
1940
85 years old
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
306 ft
16 main spans
Daily traffic
1,530
2009 count
Owner
County
County Highway Agency

About this bridge

Alta Mesa Road over Laguna Creek is a wood or timber stringer/multi-beam or girder carrying Alta Mesa Road over Laguna Creek in Sacramento County, California. It was built in 1940, so it is 85 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: open, would be posted or closed except for temporary shoring.

It carries about 1,530 vehicles a day, roughly 10% of them trucks, projected to reach 2,779 by 2044. The structure is 306 ft (93.3 m) long and 22 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

CarriesAlta Mesa Road
CrossesLaguna Creek
Location0.4 MI N of SR 104
RouteCounty Highway 0
Coordinates38.31044, -121.22633
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusOpen, would be posted or closed except for temporary shoring
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating0 US tons
Inventory rating0 US tons

Structure

MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans16
Design loadUnknown
Structure length306 ft (93.3 m)
Longest span19 ft (5.8 m)
Deck width22 ft (6.7 m)
Roadway width21 ft (6.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,530 (2009)
Projected traffic2,779 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.4 million (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Alta Mesa Road over Laguna Creek built?

It was built in 1940, making it 85 years old in 2025.

What condition is Alta Mesa Road over Laguna Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does Alta Mesa Road over Laguna Creek carry?

About 1,530 vehicles per day (2009 count), of which roughly 10% are trucks.

How long is Alta Mesa Road over Laguna Creek?

The structure is 306 ft (93.3 m) long with a longest span of 19 ft (5.8 m) and a deck 22 ft wide.

Who owns Alta Mesa Road over Laguna Creek?

It is owned by the County Highway Agency.