US Bridges

Muir Woods RD over Redwood Creek

Good

Marin County, California · 0.7 MI N of SR 1 · Structure no. 27C0108

Built
1958
67 years old
Condition
Good
inspected July 2021
Type
Slab
Concrete Continuous
Length
100 ft
3 main spans
Daily traffic
2,187
2001 count
Owner
County
County Highway Agency

About this bridge

Muir Woods RD over Redwood Creek is a concrete continuous slab carrying Muir Woods RD over Redwood Creek in Marin County, California. It was built in 1958, so it is 67 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,187 vehicles a day, roughly 2% of them trucks, projected to reach 2,984 by 2043. The structure is 100 ft (30.6 m) long and 28 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesMuir Woods RD
CrossesRedwood Creek
Location0.7 MI N of SR 1
RouteCounty Highway 0
CountyMarin County
StateCalifornia
Coordinates37.87482, -122.583
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJuly 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating59.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length100 ft (30.6 m)
Longest span32 ft (9.8 m)
Deck width28 ft (8.5 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,187 (2001)
Projected traffic2,984 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Muir Woods RD over Redwood Creek built?

It was built in 1958, making it 67 years old in 2025.

What condition is Muir Woods RD over Redwood Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2021.

How much traffic does Muir Woods RD over Redwood Creek carry?

About 2,187 vehicles per day (2001 count), of which roughly 2% are trucks.

How long is Muir Woods RD over Redwood Creek?

The structure is 100 ft (30.6 m) long with a longest span of 32 ft (9.8 m) and a deck 28 ft wide.

Who owns Muir Woods RD over Redwood Creek?

It is owned by the County Highway Agency.