US Bridges

State Route 1 over Santa Rosa Creek

Poor

San Luis Obispo County, California · 05-SLO-001-50.07 · Structure no. 49 0249

Built
2008
17 years old
Condition
Poor
inspected September 2023
Type
Slab
Concrete Continuous
Length
89 ft
2 main spans
Daily traffic
6,000
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 1 over Santa Rosa Creek is a concrete continuous slab carrying State Route 1 over Santa Rosa Creek in San Luis Obispo County, California. It was built in 2008, so it is 17 years old, younger 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 6,000 vehicles a day, projected to reach 9,246 by 2043. The structure is 89 ft (27.2 m) long and 68 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesState Route 1
CrossesSanta Rosa Creek
Location05-SLO-001-50.07
RouteState Highway 1
CountySan Luis Obispo County
StateCalifornia
Coordinates35.56331, -121.09635
Functional classUrban 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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: 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 typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length89 ft (27.2 m)
Longest span45 ft (13.6 m)
Deck width68 ft (20.8 m)
Roadway width66 ft (20 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,000 (2009)
Projected traffic9,246 by 2043
Trucks0%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$913,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 1 over Santa Rosa Creek built?

It was built in 2008, making it 17 years old in 2025.

What condition is State Route 1 over Santa Rosa 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 September 2023.

How much traffic does State Route 1 over Santa Rosa Creek carry?

About 6,000 vehicles per day (2009 count).

How long is State Route 1 over Santa Rosa Creek?

The structure is 89 ft (27.2 m) long with a longest span of 45 ft (13.6 m) and a deck 68 ft wide.

Who owns State Route 1 over Santa Rosa Creek?

It is owned by the State Highway Agency.