US Bridges

Madonna RD over US HWY 101 (@pm 27.50)

Good

San Luis Obispo County, California · 05-SLO-101-27.50-SLO · Structure no. 49 0190

Built
1963
62 years old, rebuilt 1987
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
266 ft
2 main spans
Daily traffic
22,000
2009 count
Owner
State
State Highway Agency

About this bridge

Madonna RD over US HWY 101 (@pm 27.50) is a prestressed concrete continuous stringer/multi-beam or girder carrying Madonna RD over US HWY 101 (@pm 27.50) in San Luis Obispo County, California. It was built in 1963 and reconstructed in 1987, so it is 62 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 22,000 vehicles a day, roughly 7% of them trucks, projected to reach 52,384 by 2044. The structure is 266 ft (81.1 m) long and 86 ft wide. If it were closed, the detour would be 4.3 mi (7 km).

CarriesMadonna RD
CrossesUS HWY 101 (@pm 27.50)
Location05-SLO-101-27.50-SLO
RouteCity Street 0
Coordinates35.26568, -120.67387
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20 + Mod
Structure length266 ft (81.1 m)
Longest span88 ft (26.8 m)
Deck width86 ft (26.1 m)
Roadway width78 ft (23.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,000 (2009)
Projected traffic52,384 by 2044
Trucks7%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed4.3 mi (7 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 Madonna RD over US HWY 101 (@pm 27.50) built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1987.

What condition is Madonna RD over US HWY 101 (@pm 27.50) in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2024.

How much traffic does Madonna RD over US HWY 101 (@pm 27.50) carry?

About 22,000 vehicles per day (2009 count), of which roughly 7% are trucks.

How long is Madonna RD over US HWY 101 (@pm 27.50)?

The structure is 266 ft (81.1 m) long with a longest span of 88 ft (26.8 m) and a deck 86 ft wide.

Who owns Madonna RD over US HWY 101 (@pm 27.50)?

It is owned by the State Highway Agency.