US Bridges

State Route 9 over Marshall Creek

Fair

Santa Cruz County, California · 05-SCR-009-9.85 · Structure no. 36 0050

Built
1922
103 years old, rebuilt 1957
Condition
Fair
inspected June 2024
Type
Tee Beam
Concrete
Length
26 ft
1 main span
Daily traffic
21,100
2017 count
Owner
State
State Highway Agency

About this bridge

State Route 9 over Marshall Creek is a concrete tee beam carrying State Route 9 over Marshall Creek in Santa Cruz County, California. It was built in 1922 and reconstructed in 1957, so it is 103 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 21,100 vehicles a day, roughly 4% of them trucks, projected to reach 9,717 by 2042. The structure is 26 ft (7.9 m) long and 38 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesState Route 9
CrossesMarshall Creek
Location05-SCR-009-9.85
RouteState Highway 9
CountySanta Cruz County
StateCalifornia
Coordinates37.09136, -122.09515
Functional classUrban Minor Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22.8 US tons
Inventory rating17.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span22 ft (6.7 m)
Deck width38 ft (11.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,100 (2017)
Projected traffic9,717 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.8 mi (11 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 9 over Marshall Creek built?

It was built in 1922, making it 103 years old in 2025. It was reconstructed in 1957.

What condition is State Route 9 over Marshall Creek 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 June 2024.

How much traffic does State Route 9 over Marshall Creek carry?

About 21,100 vehicles per day (2017 count), of which roughly 4% are trucks.

How long is State Route 9 over Marshall Creek?

The structure is 26 ft (7.9 m) long with a longest span of 22 ft (6.7 m) and a deck 38 ft wide.

Who owns State Route 9 over Marshall Creek?

It is owned by the State Highway Agency.