US Bridges

Nacimiento Road over San Antonio River

FairPosted for load

Monterey County, California · SW Gravel Pit RES-S6B/16B · Structure no. DAPFORLIG000754

Built
1940
85 years old, rebuilt 2008
Condition
Fair
inspected October 2023
Type
Girder and Floorbeam System
Steel
Length
256 ft
4 main spans
Daily traffic
50
2021 count
Owner
Federal
Army

About this bridge

Nacimiento Road over San Antonio River is a steel girder and floorbeam system carrying Nacimiento Road over San Antonio River in Monterey County, California. It was built in 1940 and reconstructed in 2008, 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 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. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, roughly 4% of them trucks, projected to reach 60 by 2044. The structure is 256 ft (78 m) long and 18 ft wide.

Location

Open in Google Maps
CarriesNacimiento Road
CrossesSan Antonio River
LocationSW Gravel Pit RES-S6B/16B
CountyMonterey County
StateCalifornia
Coordinates35.98453, -121.2391
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating50 US tons
Inventory rating38.6 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckOpen grating
Main spans4 (+1 approach)
Design loadUnknown
Structure length256 ft (78 m)
Longest span60 ft (18.3 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.1 m)
Vertical clearance over deck11 ft (3.4 m)

Traffic and service

Average daily traffic50 (2021)
Projected traffic60 by 2044
Trucks4%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerArmy
Maintained byArmy
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$2,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nacimiento Road over San Antonio River built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 2008.

What condition is Nacimiento Road over San Antonio River 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 Nacimiento Road over San Antonio River carry?

About 50 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is Nacimiento Road over San Antonio River?

The structure is 256 ft (78 m) long with a longest span of 60 ft (18.3 m) and a deck 18 ft wide.

Who owns Nacimiento Road over San Antonio River?

It is owned by the Army.