US Bridges

Nat Trails HWY over Arletta Ditch

PoorClosed to traffic

San Bernardino County, California · 9.9 MI E Kelbaker RD · Structure no. 54C0295

Built
1943
82 years old
Condition
Poor
inspected March 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
60 ft
3 main spans
Daily traffic
502
2013 count
Owner
County
County Highway Agency

About this bridge

Nat Trails HWY over Arletta Ditch is a wood or timber stringer/multi-beam or girder carrying Nat Trails HWY over Arletta Ditch in San Bernardino County, California. It was built in 1943, so it is 82 years old, older 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 0 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. Its operating status is: closed to all traffic.

It carries about 502 vehicles a day, roughly 30% of them trucks, projected to reach 599 by 2046. The structure is 60 ft (18.3 m) long and 27 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

CarriesNat Trails HWY
CrossesArletta Ditch
Location9.9 MI E Kelbaker RD
RouteCounty Highway 0
Coordinates34.57566, -115.47326
Functional classRural Major Collector

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
Deck0 FailedOut of service and beyond corrective action.
Superstructure0 FailedOut of service and beyond corrective action.
Substructure0 FailedOut of service and beyond corrective action.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 12 months
Operating statusClosed to all traffic
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23.3 US tons
Inventory rating16.1 US tons

Structure

MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length60 ft (18.3 m)
Longest span19 ft (5.8 m)
Deck width27 ft (8.3 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic502 (2013)
Projected traffic599 by 2046
Trucks30%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$583,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nat Trails HWY over Arletta Ditch built?

It was built in 1943, making it 82 years old in 2025.

What condition is Nat Trails HWY over Arletta Ditch 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 March 2024.

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

About 502 vehicles per day (2013 count), of which roughly 30% are trucks.

How long is Nat Trails HWY over Arletta Ditch?

The structure is 60 ft (18.3 m) long with a longest span of 19 ft (5.8 m) and a deck 27 ft wide.

Who owns Nat Trails HWY over Arletta Ditch?

It is owned by the County Highway Agency.