US Bridges

24th ST over UP RR & AMTRAK

Fair

San Luis Obispo County, California · 0.18 MI E Spring ST · Structure no. 49C0357

Built
1959
66 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
120 ft
3 main spans
Daily traffic
15,682
2008 count
Owner
City
City or Municipal Highway Agency

About this bridge

24th ST over UP RR & AMTRAK is a steel stringer/multi-beam or girder carrying 24th ST over UP RR & AMTRAK in San Luis Obispo County, California. It was built in 1959, so it is 66 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 5 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 15,682 vehicles a day, roughly 2% of them trucks, projected to reach 8,244 by 2041. The structure is 120 ft (36.6 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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Carries24th ST
CrossesUP RR & AMTRAK
Location0.18 MI E Spring ST
RouteCity Street 0
CountySan Luis Obispo County
StateCalifornia
Coordinates35.63934, -120.6893
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating63.9 US tons
Inventory rating38.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length120 ft (36.6 m)
Longest span46 ft (14.1 m)
Deck width37 ft (11.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,682 (2008)
Projected traffic8,244 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 24th ST over UP RR & AMTRAK built?

It was built in 1959, making it 66 years old in 2025.

What condition is 24th ST over UP RR & AMTRAK 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 July 2023.

How much traffic does 24th ST over UP RR & AMTRAK carry?

About 15,682 vehicles per day (2008 count), of which roughly 2% are trucks.

How long is 24th ST over UP RR & AMTRAK?

The structure is 120 ft (36.6 m) long with a longest span of 46 ft (14.1 m) and a deck 37 ft wide.

Who owns 24th ST over UP RR & AMTRAK?

It is owned by the City or Municipal Highway Agency.