US Bridges

Muir Mill RD 301C over Baechtel Creek

Good

Mendocino County, California · 2 MI SW of SR 20-MAIN ST · Structure no. 10C0215

Built
2016
9 years old
Condition
Good
inspected September 2021
Type
Box Beam or Girders - Multiple
Concrete
Length
70 ft
1 main span
Daily traffic
311
2014 count
Owner
County
County Highway Agency

About this bridge

Muir Mill RD 301C over Baechtel Creek is a concrete box beam or girders - multiple carrying Muir Mill RD 301C over Baechtel Creek in Mendocino County, California. It was built in 2016, so it is 9 years old, younger 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 311 vehicles a day, roughly 2% of them trucks, projected to reach 425 by 2043. The structure is 70 ft (21.3 m) long and 25 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesMuir Mill RD 301C
CrossesBaechtel Creek
Location2 MI SW of SR 20-MAIN ST
RouteCounty Highway 0
Coordinates39.3689, -123.36617
Functional classRural Local

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 protection7 GoodSome minor problems.
Last inspectionSeptember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length70 ft (21.3 m)
Longest span65 ft (19.8 m)
Deck width25 ft (7.7 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic311 (2014)
Projected traffic425 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed123.7 mi (199 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 Mill RD 301C over Baechtel Creek built?

It was built in 2016, making it 9 years old in 2025.

What condition is Muir Mill RD 301C over Baechtel 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 September 2021.

How much traffic does Muir Mill RD 301C over Baechtel Creek carry?

About 311 vehicles per day (2014 count), of which roughly 2% are trucks.

How long is Muir Mill RD 301C over Baechtel Creek?

The structure is 70 ft (21.3 m) long with a longest span of 65 ft (19.8 m) and a deck 25 ft wide.

Who owns Muir Mill RD 301C over Baechtel Creek?

It is owned by the County Highway Agency.