US Bridges

State Route 1 over Tembladero Slough

Good

Monterey County, California · 05-MON-001-T91.99 · Structure no. 44 0219

Built
1976
49 years old
Condition
Good
inspected August 2021
Type
Tee Beam
Concrete Continuous
Length
279 ft
7 main spans
Daily traffic
23,350
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 1 over Tembladero Slough is a concrete continuous tee beam carrying State Route 1 over Tembladero Slough in Monterey County, California. It was built in 1976, so it is 49 years old, younger 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 23,350 vehicles a day, roughly 8% of them trucks, projected to reach 32,636 by 2043. The structure is 279 ft (85 m) long and 55 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesState Route 1
CrossesTembladero Slough
Location05-MON-001-T91.99
RouteState Highway 1
Coordinates36.76757, -121.76502
Functional classRural Principal Arterial - Other

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 inspectionAugust 2021
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 geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating49.6 US tons
Inventory rating38.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20 + Mod
Structure length279 ft (85 m)
Longest span43 ft (13.1 m)
Deck width55 ft (16.9 m)
Roadway width53 ft (16.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,350 (2009)
Projected traffic32,636 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 1 over Tembladero Slough built?

It was built in 1976, making it 49 years old in 2025.

What condition is State Route 1 over Tembladero Slough 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 August 2021.

How much traffic does State Route 1 over Tembladero Slough carry?

About 23,350 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is State Route 1 over Tembladero Slough?

The structure is 279 ft (85 m) long with a longest span of 43 ft (13.1 m) and a deck 55 ft wide.

Who owns State Route 1 over Tembladero Slough?

It is owned by the State Highway Agency.