US Bridges

Road 99W over Stony Creek

Poor

Glenn County, California · 1.3 MI N of S.H. 32 · Structure no. 11C0196

Built
1913
112 years old, rebuilt 1952
Condition
Poor
inspected October 2024
Type
Arch - Deck
Concrete
Length
1,187 ft
13 main spans
Daily traffic
4,157
2019 count
Owner
County
County Highway Agency

About this bridge

Road 99W over Stony Creek is a concrete arch - deck carrying Road 99W over Stony Creek in Glenn County, California. It was built in 1913 and reconstructed in 1952, so it is 112 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 4,157 vehicles a day, roughly 10% of them trucks, projected to reach 5,898 by 2041. The structure is 1,187 ft (361.8 m) long and 32 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesRoad 99W
CrossesStony Creek
Location1.3 MI N of S.H. 32
RouteCounty Highway 0
CountyGlenn County
StateCalifornia
Coordinates39.76557, -122.19672
Functional classRural Major Collector

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
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.2 US tons
Inventory rating31.7 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans13
Design loadUnknown
Structure length1,187 ft (361.8 m)
Longest span107 ft (32.6 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,157 (2019)
Projected traffic5,898 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$13.8 million (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Road 99W over Stony Creek built?

It was built in 1913, making it 112 years old in 2025. It was reconstructed in 1952.

What condition is Road 99W over Stony 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 Road 99W over Stony Creek carry?

About 4,157 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is Road 99W over Stony Creek?

The structure is 1,187 ft (361.8 m) long with a longest span of 107 ft (32.6 m) and a deck 32 ft wide.

Who owns Road 99W over Stony Creek?

It is owned by the County Highway Agency.