US Bridges

Oak ST over Orrs Creek

Fair

Mendocino County, California · 1 MI S Gibson ST · Structure no. 10C0047

Built
1955
70 years old
Condition
Fair
inspected February 2024
Type
Arch - Deck
Steel
Length
51 ft
3 main spans
Daily traffic
1,599
2017 count
Owner
City
City or Municipal Highway Agency

About this bridge

Oak ST over Orrs Creek is a steel arch - deck carrying Oak ST over Orrs Creek in Mendocino County, California. It was built in 1955, so it is 70 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 1,599 vehicles a day, roughly 2% of them trucks, projected to reach 2,187 by 2042. The structure is 51 ft (15.4 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesOak ST
CrossesOrrs Creek
Location1 MI S Gibson ST
RouteCity Street 0
CountyMendocino County
StateCalifornia
Coordinates39.15635, -123.21117
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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionFebruary 2024
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeArch - Deck
MaterialSteel
DeckNot applicable
Main spans3
Design loadUnknown
Structure length51 ft (15.4 m)
Longest span16 ft (4.8 m)
Deck width44 ft (13.5 m)
Roadway width33 ft (10.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,599 (2017)
Projected traffic2,187 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Oak ST over Orrs Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is Oak ST over Orrs 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 February 2024.

How much traffic does Oak ST over Orrs Creek carry?

About 1,599 vehicles per day (2017 count), of which roughly 2% are trucks.

How long is Oak ST over Orrs Creek?

The structure is 51 ft (15.4 m) long with a longest span of 16 ft (4.8 m) and a deck 44 ft wide.

Who owns Oak ST over Orrs Creek?

It is owned by the City or Municipal Highway Agency.