US Bridges

School RD 427 over Oak Creek

Poor

Madera County, California · 0.1 MI E RD 418 · Structure no. 41C0123

Built
1975
50 years old
Condition
Poor
inspected September 2023
Type
Slab
Concrete Continuous
Length
60 ft
2 main spans
Daily traffic
2,066
2016 count
Owner
County
County Highway Agency

About this bridge

School RD 427 over Oak Creek is a concrete continuous slab carrying School RD 427 over Oak Creek in Madera County, California. It was built in 1975, so it is 50 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 2,066 vehicles a day, roughly 3% of them trucks, projected to reach 3,816 by 2041. The structure is 60 ft (18.3 m) long and 31 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSchool RD 427
CrossesOak Creek
Location0.1 MI E RD 418
RouteCounty Highway 0
CountyMadera County
StateCalifornia
Coordinates37.32972, -119.63816
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating35.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span29 ft (8.8 m)
Deck width31 ft (9.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,066 (2016)
Projected traffic3,816 by 2041
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$660,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was School RD 427 over Oak Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is School RD 427 over Oak Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.

How much traffic does School RD 427 over Oak Creek carry?

About 2,066 vehicles per day (2016 count), of which roughly 3% are trucks.

How long is School RD 427 over Oak Creek?

The structure is 60 ft (18.3 m) long with a longest span of 29 ft (8.8 m) and a deck 31 ft wide.

Who owns School RD 427 over Oak Creek?

It is owned by the County Highway Agency.