US Bridges

Alexander Ave over Abandoned Nwp RR Row

FairPosted for load

Marin County, California · 0.1 MI E of Magnolia Ave · Structure no. 27C0150

Built
1925
100 years old
Condition
Fair
inspected July 2023
Type
Arch - Thru
Concrete Continuous
Length
164 ft
1 main span
Daily traffic
1,570
2009 count
Owner
City
City or Municipal Highway Agency

About this bridge

Alexander Ave over Abandoned Nwp RR Row is a concrete continuous arch - thru carrying Alexander Ave over Abandoned Nwp RR Row in Marin County, California. It was built in 1925, so it is 100 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. Its operating status is: posted for load restriction.

It carries about 1,570 vehicles a day, roughly 2% of them trucks, projected to reach 3,268 by 2041. The structure is 164 ft (50 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesAlexander Ave
CrossesAbandoned Nwp RR Row
Location0.1 MI E of Magnolia Ave
RouteCity Street 0
CountyMarin County
StateCalifornia
Coordinates37.92994, -122.53236
Functional classUrban 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.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating27.9 US tons
Inventory rating16.8 US tons

Structure

Structure typeArch - Thru
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans1 (+6 approach)
Design loadUnknown
Structure length164 ft (50 m)
Longest span38 ft (11.7 m)
Deck width29 ft (8.8 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,570 (2009)
Projected traffic3,268 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Alexander Ave over Abandoned Nwp RR Row built?

It was built in 1925, making it 100 years old in 2025.

What condition is Alexander Ave over Abandoned Nwp RR Row 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 July 2023.

How much traffic does Alexander Ave over Abandoned Nwp RR Row carry?

About 1,570 vehicles per day (2009 count), of which roughly 2% are trucks.

How long is Alexander Ave over Abandoned Nwp RR Row?

The structure is 164 ft (50 m) long with a longest span of 38 ft (11.7 m) and a deck 29 ft wide.

Who owns Alexander Ave over Abandoned Nwp RR Row?

It is owned by the City or Municipal Highway Agency.