US Bridges

Lake Drive over Lake Gregory Spillway

Good

San Bernardino County, California · 1.7 MI E RTE 138 · Structure no. 54C0455

Built
1972
53 years old
Condition
Good
inspected June 2023
Type
Tee Beam
Concrete
Length
62 ft
1 main span
Daily traffic
6,473
2015 count
Owner
County
County Highway Agency

About this bridge

Lake Drive over Lake Gregory Spillway is a concrete tee beam carrying Lake Drive over Lake Gregory Spillway in San Bernardino County, California. It was built in 1972, so it is 53 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,473 vehicles a day, roughly 3% of them trucks, projected to reach 8,808 by 2045. The structure is 62 ft (18.9 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesLake Drive
CrossesLake Gregory Spillway
Location1.7 MI E RTE 138
RouteCounty Highway 0
CountySan Bernardino County
StateCalifornia
Coordinates34.24613, -117.26858
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81.8 US tons
Inventory rating49.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length62 ft (18.9 m)
Longest span61 ft (18.6 m)
Deck width41 ft (12.6 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,473 (2015)
Projected traffic8,808 by 2045
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Lake Drive over Lake Gregory Spillway built?

It was built in 1972, making it 53 years old in 2025.

What condition is Lake Drive over Lake Gregory Spillway in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does Lake Drive over Lake Gregory Spillway carry?

About 6,473 vehicles per day (2015 count), of which roughly 3% are trucks.

How long is Lake Drive over Lake Gregory Spillway?

The structure is 62 ft (18.9 m) long with a longest span of 61 ft (18.6 m) and a deck 41 ft wide.

Who owns Lake Drive over Lake Gregory Spillway?

It is owned by the County Highway Agency.