US Bridges

Todd Road over U.S. Highway 101 & Ramps

Fair

Sonoma County, California · 04-SON-101-16.54 · Structure no. 20 0172

Built
1957
68 years old
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
208 ft
4 main spans
Daily traffic
1,100
2014 count
Owner
State
State Highway Agency

About this bridge

Todd Road over U.S. Highway 101 & Ramps is a concrete continuous box beam or girders - multiple carrying Todd Road over U.S. Highway 101 & Ramps in Sonoma County, California. It was built in 1957, so it is 68 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 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 1,100 vehicles a day, roughly 2% of them trucks, projected to reach 4,176 by 2046. The structure is 208 ft (63.4 m) long and 33 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesTodd Road
CrossesU.S. Highway 101 & Ramps
Location04-SON-101-16.54
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.38622, -122.71656
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.7 US tons
Inventory rating41.4 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length208 ft (63.4 m)
Longest span75 ft (22.9 m)
Deck width33 ft (10 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2014)
Projected traffic4,176 by 2046
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed6.8 mi (11 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Todd Road over U.S. Highway 101 & Ramps built?

It was built in 1957, making it 68 years old in 2025.

What condition is Todd Road over U.S. Highway 101 & Ramps 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 Todd Road over U.S. Highway 101 & Ramps carry?

About 1,100 vehicles per day (2014 count), of which roughly 2% are trucks.

How long is Todd Road over U.S. Highway 101 & Ramps?

The structure is 208 ft (63.4 m) long with a longest span of 75 ft (22.9 m) and a deck 33 ft wide.

Who owns Todd Road over U.S. Highway 101 & Ramps?

It is owned by the State Highway Agency.