US Bridges

12th St/Imjin Pkwy over State Route 1

Good

Monterey County, California · 05-MON-001-R84.48 · Structure no. 44 0203

Built
1973
52 years old
Condition
Good
inspected August 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
198 ft
2 main spans
Daily traffic
11,950
2015 count
Owner
State
State Highway Agency

About this bridge

12th St/Imjin Pkwy over State Route 1 is a concrete continuous box beam or girders - multiple carrying 12th St/Imjin Pkwy over State Route 1 in Monterey County, California. It was built in 1973, so it is 52 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 11,950 vehicles a day, roughly 3% of them trucks, projected to reach 19,228 by 2043. The structure is 198 ft (60.2 m) long and 42 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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Carries12th St/Imjin Pkwy
CrossesState Route 1
Location05-MON-001-R84.48
RouteCounty Highway 0
CountyMonterey County
StateCalifornia
Coordinates36.66951, -121.81336
Functional classUrban Other Principal Arterial

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.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating37.1 US tons
Inventory rating28.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length198 ft (60.2 m)
Longest span99 ft (30.3 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,950 (2015)
Projected traffic19,228 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 12th St/Imjin Pkwy over State Route 1 built?

It was built in 1973, making it 52 years old in 2025.

What condition is 12th St/Imjin Pkwy over State Route 1 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 2023.

How much traffic does 12th St/Imjin Pkwy over State Route 1 carry?

About 11,950 vehicles per day (2015 count), of which roughly 3% are trucks.

How long is 12th St/Imjin Pkwy over State Route 1?

The structure is 198 ft (60.2 m) long with a longest span of 99 ft (30.3 m) and a deck 42 ft wide.

Who owns 12th St/Imjin Pkwy over State Route 1?

It is owned by the State Highway Agency.