US Bridges

Highway 129 over Drainage Ditch

Good

Santa Cruz County, California · 05-SCR-129-3.52 · Structure no. 36 0118

Built
2012
13 years old
Condition
Good
inspected June 2024
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
8,000
2015 count
Owner
State
State Highway Agency

About this bridge

Highway 129 over Drainage Ditch is a concrete continuous culvert carrying Highway 129 over Drainage Ditch in Santa Cruz County, California. It was built in 2012, so it is 13 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 8,000 vehicles a day, roughly 21% of them trucks, projected to reach 9,200 by 2042. The structure is 22 ft (6.7 m) long and 84 ft wide. If it were closed, the detour would be 9.3 mi (15 km).

CarriesHighway 129
CrossesDrainage Ditch
Location05-SCR-129-3.52
RouteState Highway 129
Coordinates36.9231, -121.69501
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span10 ft (3.1 m)
Deck width84 ft (25.5 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,000 (2015)
Projected traffic9,200 by 2042
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.3 mi (15 km)
TollOn a free road
National Highway SystemNo

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 Highway 129 over Drainage Ditch built?

It was built in 2012, making it 13 years old in 2025.

What condition is Highway 129 over Drainage Ditch 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 June 2024.

How much traffic does Highway 129 over Drainage Ditch carry?

About 8,000 vehicles per day (2015 count), of which roughly 21% are trucks.

How long is Highway 129 over Drainage Ditch?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3.1 m) and a deck 84 ft wide.

Who owns Highway 129 over Drainage Ditch?

It is owned by the State Highway Agency.