US Bridges

Glenwood Ave over Ross Creek

Fair

Marin County, California · Just N/O Lagunitas RD · Structure no. 27C0072

Built
1909
116 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete Continuous
Length
51 ft
3 main spans
Daily traffic
2,370
2004 count
Owner
City
City or Municipal Highway Agency

About this bridge

Glenwood Ave over Ross Creek is a concrete continuous slab carrying Glenwood Ave over Ross Creek in Marin County, California. It was built in 1909, so it is 116 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 2,370 vehicles a day, roughly 2% of them trucks, projected to reach 3,272 by 2041. The structure is 51 ft (15.4 m) long and 20 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesGlenwood Ave
CrossesRoss Creek
LocationJust N/O Lagunitas RD
RouteCity Street 0
CountyMarin County
StateCalifornia
Coordinates37.96235, -122.56884
Functional classUrban Collector

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating31.1 US tons
Inventory rating18.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length51 ft (15.4 m)
Longest span25 ft (7.6 m)
Deck width20 ft (6.2 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,370 (2004)
Projected traffic3,272 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Glenwood Ave over Ross Creek built?

It was built in 1909, making it 116 years old in 2025.

What condition is Glenwood Ave over Ross 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 July 2023.

How much traffic does Glenwood Ave over Ross Creek carry?

About 2,370 vehicles per day (2004 count), of which roughly 2% are trucks.

How long is Glenwood Ave over Ross Creek?

The structure is 51 ft (15.4 m) long with a longest span of 25 ft (7.6 m) and a deck 20 ft wide.

Who owns Glenwood Ave over Ross Creek?

It is owned by the City or Municipal Highway Agency.