US Bridges

Mission Blvd over Santa Rosa Creek

Fair

Sonoma County, California · 0.1 MI S Sonoma HWY SR 12 · Structure no. 20C0167

Built
1956
69 years old, rebuilt 1981
Condition
Fair
inspected August 2024
Type
Slab
Concrete Continuous
Length
183 ft
5 main spans
Daily traffic
20,000
2010 count
Owner
City
City or Municipal Highway Agency

About this bridge

Mission Blvd over Santa Rosa Creek is a concrete continuous slab carrying Mission Blvd over Santa Rosa Creek in Sonoma County, California. It was built in 1956 and reconstructed in 1981, so it is 69 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 20,000 vehicles a day, roughly 5% of them trucks, projected to reach 15,649 by 2042. The structure is 183 ft (55.8 m) long and 74 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesMission Blvd
CrossesSanta Rosa Creek
Location0.1 MI S Sonoma HWY SR 12
RouteCity Street 0
CountySonoma County
StateCalifornia
Coordinates38.45777, -122.67256
Functional classUrban Minor Arterial

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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating40.3 US tons
Inventory rating28.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length183 ft (55.8 m)
Longest span40 ft (12.2 m)
Deck width74 ft (22.7 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,000 (2010)
Projected traffic15,649 by 2042
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Mission Blvd over Santa Rosa Creek built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1981.

What condition is Mission Blvd over Santa Rosa Creek 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 Mission Blvd over Santa Rosa Creek carry?

About 20,000 vehicles per day (2010 count), of which roughly 5% are trucks.

How long is Mission Blvd over Santa Rosa Creek?

The structure is 183 ft (55.8 m) long with a longest span of 40 ft (12.2 m) and a deck 74 ft wide.

Who owns Mission Blvd over Santa Rosa Creek?

It is owned by the City or Municipal Highway Agency.