US Bridges

Emergency Exit RD over Alpine Creek

Fair

San Mateo County, California · South of SR 84 · Structure no. 35C0125

Built
1981
44 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
90 ft
3 main spans
Daily traffic
1
2011 count
Owner
County
County Highway Agency

About this bridge

Emergency Exit RD over Alpine Creek is a steel continuous stringer/multi-beam or girder carrying Emergency Exit RD over Alpine Creek in San Mateo County, California. It was built in 1981, so it is 44 years old, younger 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 1 vehicles a day, projected to reach 1 by 2044. The structure is 90 ft (27.4 m) long and 9 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesEmergency Exit RD
CrossesAlpine Creek
LocationSouth of SR 84
RouteCounty Highway 0
CountySan Mateo County
StateCalifornia
Coordinates37.31057, -122.27755
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 alignment6: Equal to present minimum criteria
Operating rating28.5 US tons
Inventory rating19 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckSteel plate
Main spans3
Design loadUnknown
Structure length90 ft (27.4 m)
Longest span66 ft (20.1 m)
Deck width9 ft (2.7 m)
Roadway width8 ft (2.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1 (2011)
Projected traffic1 by 2044
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Emergency Exit RD over Alpine Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is Emergency Exit RD over Alpine 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 April 2024.

How much traffic does Emergency Exit RD over Alpine Creek carry?

About 1 vehicles per day (2011 count).

How long is Emergency Exit RD over Alpine Creek?

The structure is 90 ft (27.4 m) long with a longest span of 66 ft (20.1 m) and a deck 9 ft wide.

Who owns Emergency Exit RD over Alpine Creek?

It is owned by the County Highway Agency.