US Bridges

Nat Trails HWY over Siberia Ditch

FairPosted for load

San Bernardino County, California · 13.2 MI E Crucero RD · Structure no. 54C0243

Built
1930
95 years old, rebuilt 1952
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
61 ft
3 main spans
Daily traffic
235
2020 count
Owner
County
County Highway Agency

About this bridge

Nat Trails HWY over Siberia Ditch is a wood or timber stringer/multi-beam or girder carrying Nat Trails HWY over Siberia Ditch in San Bernardino County, California. It was built in 1930 and reconstructed in 1952, 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: posted for load restriction.

It carries about 235 vehicles a day, roughly 20% of them trucks, projected to reach 281 by 2045. The structure is 61 ft (18.6 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
CrossesSiberia Ditch
Location13.2 MI E Crucero RD
RouteCounty Highway 0
CountySan Bernardino County
StateCalifornia
Coordinates34.62515, -115.99032
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22.5 US tons
Inventory rating12.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length61 ft (18.6 m)
Longest span19 ft (5.9 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic235 (2020)
Projected traffic281 by 2045
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 Siberia Ditch built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1952.

What condition is Nat Trails HWY over Siberia 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 February 2024.

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

About 235 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is Nat Trails HWY over Siberia Ditch?

The structure is 61 ft (18.6 m) long with a longest span of 19 ft (5.9 m) and a deck 28 ft wide.

Who owns Nat Trails HWY over Siberia Ditch?

It is owned by the County Highway Agency.