US Bridges

Tomki RD over Mossy Canyon Creek

Fair

Mendocino County, California · 3.82 MI N CR 237 · Structure no. 10C0162

Built
1960
65 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
393
2011 count
Owner
County
County Highway Agency

About this bridge

Tomki RD over Mossy Canyon Creek is a concrete slab carrying Tomki RD over Mossy Canyon Creek in Mendocino County, California. It was built in 1960, so it is 65 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 393 vehicles a day, roughly 5% of them trucks, projected to reach 382 by 2041. The structure is 23 ft (7 m) long and 29 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

CarriesTomki RD
CrossesMossy Canyon Creek
Location3.82 MI N CR 237
RouteCounty Highway 0
Coordinates39.36263, -123.23332
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length23 ft (7 m)
Longest span22 ft (6.7 m)
Deck width29 ft (8.8 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic393 (2011)
Projected traffic382 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 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 Tomki RD over Mossy Canyon Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is Tomki RD over Mossy Canyon 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 Tomki RD over Mossy Canyon Creek carry?

About 393 vehicles per day (2011 count), of which roughly 5% are trucks.

How long is Tomki RD over Mossy Canyon Creek?

The structure is 23 ft (7 m) long with a longest span of 22 ft (6.7 m) and a deck 29 ft wide.

Who owns Tomki RD over Mossy Canyon Creek?

It is owned by the County Highway Agency.