US Bridges

Franz Valey Sch RD over Franz Creek

Poor

Sonoma County, California · Just N/O Franz RD · Structure no. 20C0326

Built
1946
79 years old, rebuilt 2002
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
32 ft
1 main span
Daily traffic
350
2015 count
Owner
County
County Highway Agency

About this bridge

Franz Valey Sch RD over Franz Creek is a steel stringer/multi-beam or girder carrying Franz Valey Sch RD over Franz Creek in Sonoma County, California. It was built in 1946 and reconstructed in 2002, so it is 79 years old, older 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 350 vehicles a day, roughly 1% of them trucks, projected to reach 437 by 2046. The structure is 32 ft (9.8 m) long and 23 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

CarriesFranz Valey Sch RD
CrossesFranz Creek
LocationJust N/O Franz RD
RouteCounty Highway 0
Coordinates38.58371, -122.67183
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating34.3 US tons
Inventory rating20.7 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length32 ft (9.8 m)
Longest span28 ft (8.4 m)
Deck width23 ft (7 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2015)
Projected traffic437 by 2046
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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$251,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Franz Valey Sch RD over Franz Creek built?

It was built in 1946, making it 79 years old in 2025. It was reconstructed in 2002.

What condition is Franz Valey Sch RD over Franz 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 October 2024.

How much traffic does Franz Valey Sch RD over Franz Creek carry?

About 350 vehicles per day (2015 count), of which roughly 1% are trucks.

How long is Franz Valey Sch RD over Franz Creek?

The structure is 32 ft (9.8 m) long with a longest span of 28 ft (8.4 m) and a deck 23 ft wide.

Who owns Franz Valey Sch RD over Franz Creek?

It is owned by the County Highway Agency.