US Bridges

IRR Sherwood Road over Sherwood Creek

Fair

Mendocino County, California · 10.1 MI NE of US 101 · Structure no. 10C0016

Built
1947
78 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
48 ft
3 main spans
Daily traffic
139
2011 count
Owner
County
County Highway Agency

About this bridge

IRR Sherwood Road over Sherwood Creek is a wood or timber stringer/multi-beam or girder carrying IRR Sherwood Road over Sherwood Creek in Mendocino County, California. It was built in 1947, so it is 78 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 139 vehicles a day, roughly 10% of them trucks, projected to reach 110 by 2046. The structure is 48 ft (14.6 m) long and 18 ft wide. If it were closed, the detour would be 32.9 mi (53 km).

Location

Open in Google Maps
CarriesIRR Sherwood Road
CrossesSherwood Creek
Location10.1 MI NE of US 101
RouteCounty Highway 0
CountyMendocino County
StateCalifornia
Coordinates39.52939, -123.453
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating34 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadUnknown
Structure length48 ft (14.6 m)
Longest span19 ft (5.8 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic139 (2011)
Projected traffic110 by 2046
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed32.9 mi (53 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 IRR Sherwood Road over Sherwood Creek built?

It was built in 1947, making it 78 years old in 2025.

What condition is IRR Sherwood Road over Sherwood 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 2024.

How much traffic does IRR Sherwood Road over Sherwood Creek carry?

About 139 vehicles per day (2011 count), of which roughly 10% are trucks.

How long is IRR Sherwood Road over Sherwood Creek?

The structure is 48 ft (14.6 m) long with a longest span of 19 ft (5.8 m) and a deck 18 ft wide.

Who owns IRR Sherwood Road over Sherwood Creek?

It is owned by the County Highway Agency.