US Bridges

Nat Trails HWY over Alsa Ditch

Fair

San Bernardino County, California · 3.7 MI E Kelbaker RD · Structure no. 54C0288

Built
1930
95 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
40 ft
2 main spans
Daily traffic
502
2015 count
Owner
County
County Highway Agency

About this bridge

Nat Trails HWY over Alsa Ditch is a wood or timber stringer/multi-beam or girder carrying Nat Trails HWY over Alsa Ditch in San Bernardino County, California. It was built in 1930, so it is 95 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. Its operating status is: open, would be posted or closed except for temporary shoring.

It carries about 502 vehicles a day, roughly 20% of them trucks, projected to reach 599 by 2046. The structure is 40 ft (12.2 m) long and 28 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

Location

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CarriesNat Trails HWY
CrossesAlsa Ditch
Location3.7 MI E Kelbaker RD
RouteCounty Highway 0
CountySan Bernardino County
StateCalifornia
Coordinates34.56128, -115.57815
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, would be posted or closed except for temporary shoring
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating20.7 US tons
Inventory rating10.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length40 ft (12.2 m)
Longest span19 ft (5.8 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic502 (2015)
Projected traffic599 by 2046
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.8 mi (64 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nat Trails HWY over Alsa Ditch built?

It was built in 1930, making it 95 years old in 2025.

What condition is Nat Trails HWY over Alsa Ditch 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 November 2024.

How much traffic does Nat Trails HWY over Alsa Ditch carry?

About 502 vehicles per day (2015 count), of which roughly 20% are trucks.

How long is Nat Trails HWY over Alsa Ditch?

The structure is 40 ft (12.2 m) long with a longest span of 19 ft (5.8 m) and a deck 28 ft wide.

Who owns Nat Trails HWY over Alsa Ditch?

It is owned by the County Highway Agency.