US Bridges

US Highway 101 over Steele Lane

Fair

Sonoma County, California · 04-SON-101-21.74-SRO · Structure no. 20 0299

Built
2009
16 years old
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
125 ft
1 main span
Daily traffic
96,000
2011 count
Owner
State
State Highway Agency

About this bridge

US Highway 101 over Steele Lane is a prestressed concrete box beam or girders - multiple carrying US Highway 101 over Steele Lane in Sonoma County, California. It was built in 2009, so it is 16 years old, younger 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 6 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 96,000 vehicles a day, roughly 6% of them trucks, projected to reach 191,305 by 2046. The structure is 125 ft (38 m) long and 115 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesUS Highway 101
CrossesSteele Lane
Location04-SON-101-21.74-SRO
RouteU.S. Route 101
CountySonoma County
StateCalifornia
Coordinates38.45979, -122.72609
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length125 ft (38 m)
Longest span121 ft (37 m)
Deck width115 ft (35.2 m)
Roadway width112 ft (34 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic96,000 (2011)
Projected traffic191,305 by 2046
Trucks6%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US Highway 101 over Steele Lane built?

It was built in 2009, making it 16 years old in 2025.

What condition is US Highway 101 over Steele Lane 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 August 2024.

How much traffic does US Highway 101 over Steele Lane carry?

About 96,000 vehicles per day (2011 count), of which roughly 6% are trucks.

How long is US Highway 101 over Steele Lane?

The structure is 125 ft (38 m) long with a longest span of 121 ft (37 m) and a deck 115 ft wide.

Who owns US Highway 101 over Steele Lane?

It is owned by the State Highway Agency.