US Bridges

Nat Trails HWY over Terzilla Ditch

FairClosed to traffic

San Bernardino County, California · 10.2 MI E Kelbaker RD · Structure no. 54C0296

Built
1930
95 years old, rebuilt 1950
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
40 ft
2 main spans
Daily traffic
510
2015 count
Owner
County
County Highway Agency

About this bridge

Nat Trails HWY over Terzilla Ditch is a wood or timber stringer/multi-beam or girder carrying Nat Trails HWY over Terzilla Ditch in San Bernardino County, California. It was built in 1930 and reconstructed in 1950, 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: closed to all traffic.

It carries about 510 vehicles a day, roughly 30% of them trucks, projected to reach 587 by 2041. The structure is 40 ft (12.2 m) long and 27 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

Location

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CarriesNat Trails HWY
CrossesTerzilla Ditch
Location10.2 MI E Kelbaker RD
RouteCounty Highway 0
CountySan Bernardino County
StateCalifornia
Coordinates34.57866, -115.46905
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 protection6 SatisfactoryStructural elements show some minor deterioration.
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 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 US tons
Inventory rating11.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 15
Structure length40 ft (12.2 m)
Longest span19 ft (5.8 m)
Deck width27 ft (8.3 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic510 (2015)
Projected traffic587 by 2041
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nat Trails HWY over Terzilla Ditch built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1950.

What condition is Nat Trails HWY over Terzilla 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 March 2024.

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

About 510 vehicles per day (2015 count), of which roughly 30% are trucks.

How long is Nat Trails HWY over Terzilla Ditch?

The structure is 40 ft (12.2 m) long with a longest span of 19 ft (5.8 m) and a deck 27 ft wide.

Who owns Nat Trails HWY over Terzilla Ditch?

It is owned by the County Highway Agency.