US Bridges

State Route 116 over Green Valley Creek

Poor

Sonoma County, California · 04-SON-116-18.66 · Structure no. 20 0092

Built
1930
95 years old
Condition
Poor
inspected November 2024
Type
Tee Beam
Concrete Continuous
Length
187 ft
8 main spans
Daily traffic
12,400
2016 count
Owner
State
State Highway Agency

About this bridge

State Route 116 over Green Valley Creek is a concrete continuous tee beam carrying State Route 116 over Green Valley Creek in Sonoma County, California. It was built in 1930, 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 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 12,400 vehicles a day, projected to reach 5,630 by 2046. The structure is 187 ft (57 m) long and 28 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesState Route 116
CrossesGreen Valley Creek
Location04-SON-116-18.66
RouteState Highway 116
Coordinates38.47324, -122.90786
Functional classRural Minor Arterial

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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, 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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionNovember 2024
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating24.3 US tons
Inventory rating18.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 15
Structure length187 ft (57 m)
Longest span23 ft (7 m)
Deck width28 ft (8.4 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,400 (2016)
Projected traffic5,630 by 2046
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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$1.9 million (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 116 over Green Valley Creek built?

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

What condition is State Route 116 over Green Valley 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 November 2024.

How much traffic does State Route 116 over Green Valley Creek carry?

About 12,400 vehicles per day (2016 count).

How long is State Route 116 over Green Valley Creek?

The structure is 187 ft (57 m) long with a longest span of 23 ft (7 m) and a deck 28 ft wide.

Who owns State Route 116 over Green Valley Creek?

It is owned by the State Highway Agency.