US Bridges

Neeley Road over Hillside

Fair

Sonoma County, California · 1.1 MI W S.H. 116 · Structure no. 20C0356

Built
1930
95 years old, rebuilt 2019
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
200 ft
10 main spans
Daily traffic
3,000
2011 count
Owner
County
County Highway Agency

About this bridge

Neeley Road over Hillside is a steel stringer/multi-beam or girder carrying Neeley Road over Hillside in Sonoma County, California. It was built in 1930 and reconstructed in 2019, so it is 95 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 3,000 vehicles a day, roughly 2% of them trucks, projected to reach 1,750 by 2042. The structure is 200 ft (61 m) long and 12 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesNeeley Road
CrossesHillside
Location1.1 MI W S.H. 116
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.49261, -123.00792
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.5 US tons
Inventory rating17.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans10
Design loadUnknown
Structure length200 ft (61 m)
Longest span30 ft (9.1 m)
Deck width12 ft (3.6 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2011)
Projected traffic1,750 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed3.1 mi (5 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 Neeley Road over Hillside built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 2019.

What condition is Neeley Road over Hillside 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 March 2024.

How much traffic does Neeley Road over Hillside carry?

About 3,000 vehicles per day (2011 count), of which roughly 2% are trucks.

How long is Neeley Road over Hillside?

The structure is 200 ft (61 m) long with a longest span of 30 ft (9.1 m) and a deck 12 ft wide.

Who owns Neeley Road over Hillside?

It is owned by the County Highway Agency.