US Bridges

US 101 Rollins RD over Transmission Canal

Fair

San Mateo County, California · 04-SM-101-16.40-BURL · Structure no. 35 0017

Built
1928
97 years old, rebuilt 1970
Condition
Fair
inspected April 2023
Type
Culvert
Concrete Continuous
Length
34 ft
3 main spans
Daily traffic
232,000
2009 count
Owner
State
State Highway Agency

About this bridge

US 101 Rollins RD over Transmission Canal is a concrete continuous culvert carrying US 101 Rollins RD over Transmission Canal in San Mateo County, California. It was built in 1928 and reconstructed in 1970, so it is 97 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 6 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 232,000 vehicles a day, roughly 4% of them trucks, projected to reach 302,544 by 2040. The structure is 34 ft (10.4 m) long. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesUS 101 Rollins RD
CrossesTransmission Canal
Location04-SM-101-16.40-BURL
RouteU.S. Route 101
CountySan Mateo County
StateCalifornia
Coordinates37.58863, -122.3584
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadUnknown
Structure length34 ft (10.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic232,000 (2009)
Projected traffic302,544 by 2040
Trucks4%
Lanes on structure14
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 US 101 Rollins RD over Transmission Canal built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1970.

What condition is US 101 Rollins RD over Transmission Canal 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 2023.

How much traffic does US 101 Rollins RD over Transmission Canal carry?

About 232,000 vehicles per day (2009 count), of which roughly 4% are trucks.

How long is US 101 Rollins RD over Transmission Canal?

The structure is 34 ft (10.4 m) long with a longest span of 10 ft (3 m).

Who owns US 101 Rollins RD over Transmission Canal?

It is owned by the State Highway Agency.