US Bridges

Hilton Drive over Boulder Creek

Poor

Santa Cruz County, California · Boulder Crk Country Club · Structure no. 36C0144

Built
1959
66 years old
Condition
Poor
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
31 ft
1 main span
Daily traffic
2,500
2015 count
Owner
County
County Highway Agency

About this bridge

Hilton Drive over Boulder Creek is a steel stringer/multi-beam or girder carrying Hilton Drive over Boulder Creek in Santa Cruz County, California. It was built in 1959, so it is 66 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 2,500 vehicles a day, roughly 10% of them trucks, projected to reach 2,856 by 2042. The structure is 31 ft (9.6 m) long and 30 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesHilton Drive
CrossesBoulder Creek
LocationBoulder Crk Country Club
RouteCounty Highway 0
Coordinates37.15363, -122.16191
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.6 US tons
Inventory rating20.7 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length31 ft (9.6 m)
Longest span31 ft (9.4 m)
Deck width30 ft (9.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,500 (2015)
Projected traffic2,856 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$332,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Hilton Drive over Boulder Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is Hilton Drive over Boulder Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does Hilton Drive over Boulder Creek carry?

About 2,500 vehicles per day (2015 count), of which roughly 10% are trucks.

How long is Hilton Drive over Boulder Creek?

The structure is 31 ft (9.6 m) long with a longest span of 31 ft (9.4 m) and a deck 30 ft wide.

Who owns Hilton Drive over Boulder Creek?

It is owned by the County Highway Agency.