US Bridges

Nat Trails HWY over Avis Ditch

PoorClosed to traffic

San Bernardino County, California · 0.1 MI E of Essex RD · Structure no. 54C0324

Built
1930
95 years old, rebuilt 1953
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
40 ft
2 main spans
Daily traffic
520
2022 count
Owner
County
County Highway Agency

About this bridge

Nat Trails HWY over Avis Ditch is a wood or timber stringer/multi-beam or girder carrying Nat Trails HWY over Avis Ditch in San Bernardino County, California. It was built in 1930 and reconstructed in 1953, 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 poor condition with a lowest component rating of 4 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 520 vehicles a day, roughly 30% of them trucks, projected to reach 582 by 2045. The structure is 40 ft (12.2 m) long and 28 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

CarriesNat Trails HWY
CrossesAvis Ditch
Location0.1 MI E of Essex RD
RouteCounty Highway 0
Coordinates34.73627, -115.24444
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
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, 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 inspectionJuly 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 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 rating21.1 US tons
Inventory rating12.9 US tons

Structure

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 (8.6 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic520 (2022)
Projected traffic582 by 2045
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 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$405,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nat Trails HWY over Avis Ditch built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1953.

What condition is Nat Trails HWY over Avis 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 July 2024.

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

About 520 vehicles per day (2022 count), of which roughly 30% are trucks.

How long is Nat Trails HWY over Avis 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 Avis Ditch?

It is owned by the County Highway Agency.