US Bridges

Alum Rock Falls RD over Penitencia Creek

GoodPosted for load

Santa Clara County, California · 1.8 MI NE of Park Gate · Structure no. 37C0512

Built
1922
103 years old, rebuilt 1997
Condition
Good
inspected March 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
100 ft
5 main spans
Daily traffic
10
2010 count
Owner
County
County Highway Agency

About this bridge

Alum Rock Falls RD over Penitencia Creek is a wood or timber stringer/multi-beam or girder carrying Alum Rock Falls RD over Penitencia Creek in Santa Clara County, California. It was built in 1922 and reconstructed in 1997, 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 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. Its operating status is: posted for load restriction.

It carries about 10 vehicles a day, roughly 5% of them trucks, projected to reach 13 by 2042. The structure is 100 ft (30.6 m) long and 17 ft wide. If it were closed, the detour would be 18.6 mi (30 km).

CarriesAlum Rock Falls RD
CrossesPenitencia Creek
Location1.8 MI NE of Park Gate
RouteCounty Highway 0
Coordinates37.40584, -121.77776
Functional classRural Local

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 inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating12.1 US tons
Inventory rating9.6 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans5
Design loadUnknown
Structure length100 ft (30.6 m)
Longest span24 ft (7.3 m)
Deck width17 ft (5.2 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2010)
Projected traffic13 by 2042
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18.6 mi (30 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Alum Rock Falls RD over Penitencia Creek built?

It was built in 1922, making it 103 years old in 2025. It was reconstructed in 1997.

What condition is Alum Rock Falls RD over Penitencia Creek 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 March 2024.

How much traffic does Alum Rock Falls RD over Penitencia Creek carry?

About 10 vehicles per day (2010 count), of which roughly 5% are trucks.

How long is Alum Rock Falls RD over Penitencia Creek?

The structure is 100 ft (30.6 m) long with a longest span of 24 ft (7.3 m) and a deck 17 ft wide.

Who owns Alum Rock Falls RD over Penitencia Creek?

It is owned by the County Highway Agency.