US Bridges

Mountain View Ave over San Geromino Creek

Fair

Marin County, California · Int Sir Francis Drake Bl · Structure no. 27C0154

Built
1962
63 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
51 ft
3 main spans
Daily traffic
100
1987 count
Owner
County
County Highway Agency

About this bridge

Mountain View Ave over San Geromino Creek is a steel continuous stringer/multi-beam or girder carrying Mountain View Ave over San Geromino Creek in Marin County, California. It was built in 1962, so it is 63 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 100 vehicles a day, projected to reach 114 by 2043. The structure is 51 ft (15.5 m) long and 12 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesMountain View Ave
CrossesSan Geromino Creek
LocationInt Sir Francis Drake Bl
RouteCounty Highway 0
CountyMarin County
StateCalifornia
Coordinates38.01278, -122.69938
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
Deck7 GoodSome minor problems.
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
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 adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating45 US tons
Inventory rating26.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckWood or timber
Main spans3
Design loadUnknown
Structure length51 ft (15.5 m)
Longest span38 ft (11.6 m)
Deck width12 ft (3.7 m)
Roadway width11 ft (3.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (1987)
Projected traffic114 by 2043
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Mountain View Ave over San Geromino Creek built?

It was built in 1962, making it 63 years old in 2025.

What condition is Mountain View Ave over San Geromino 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 August 2023.

How much traffic does Mountain View Ave over San Geromino Creek carry?

About 100 vehicles per day (1987 count).

How long is Mountain View Ave over San Geromino Creek?

The structure is 51 ft (15.5 m) long with a longest span of 38 ft (11.6 m) and a deck 12 ft wide.

Who owns Mountain View Ave over San Geromino Creek?

It is owned by the County Highway Agency.