I can't confirm this, however, the update below sure sounds like it could be our over the side victim....

[UPDATE]
TRAUMATIC INJURY in BIG BEAR LAKE
Big Bear Medic Truck 281 Is On Scene Of A Trauma Victim On Highway 18 Between Icebox And Keystone Road On South Shore. An Als Medical Helicopter Has Been Requested. Landing Zone Big Bear City Airport. Big Bear Ambulance Will Be Transporting This Victim To The Airport For Transport To Trauma Center.
DETAILS: [Click Here]

I wonder if it is known if the driver fled or were they ejected in the crash, yet still can't be found.

Good grief! I sure hope the driver is found ok. 🙏

[UPDATE]
VEH OVER THE SIDE in BIG BEAR LAKE
Units Are Still Unable To Locate Anyone From The Vehicle. Tow Trucks Are On Scene Now And They Are Going To Try And Pull Up The Vehicle. Expect Delays In This Area As Crews Continue To Work The Incident.
DETAILS: [Click Here]

[UPDATE]
TRAFFIC ACCIDENT in BIG BEAR LAKE
Incident Command Has Requested The Sheriffs Search And Rescue Team. The Usfs Is Also Sending A 20 Person Hand Crew To The Incident To Assist In Locating The Person From This Vehicle As Well As Assist With Any Extrication Needs.
DETAILS: [Click Here]

[UPDATE]
TRAFFIC ACCIDENT in BIG BEAR LAKE
Still Unable To Locate The Driver Of The Vehicle. Sending More Firefighters And Leo Down To The Vehicle To Start A Grid Search. Helicopter Is Also Over The Scene.
DETAILS: [Click Here]

[UPDATE]
TRAFFIC ACCIDENT in BIG BEAR LAKE
Per Scanner. Patient Is Apparently Out Of The Vehicle And Walking Around. Unknown Location At This Time. 40 King Helo Enroute..
DETAILS: [Click Here]

[UPDATE]
TRAFFIC ACCIDENT in BIG BEAR LAKE
Units Can Confirm They Have 1 Patient In The Vehicle. Unknown Condition. They Will Be Sending Down A Medical Team. They Can Then Assess The Patient And Figure Out An Extrication Plan. Expect Major Delays Hwy 18 West Of The Big Bear Dam.
DETAILS: [Click Here]

[UPDATE]
TRAFFIC ACCIDENT in BIG BEAR LAKE
Station 96 Units Are On Scene Of The Vehicle Over The Side. They Have A Vehicle 200-300 Feet Over The Side. Major Damage. Units Will Try To Make Access To This Vehicle.
DETAILS: [Click Here]

[BFA INCIDENT DISPATCH]
TRAFFIC ACCIDENT IN BIG BEAR LAKE - NB HWY MM BIG BEAR LAKE
DETAILS: [Click Here]

[UPDATE]
TRAFFIC ACCIDENT in BIG BEAR LAKE
Reported Vehicle Over The Side. Highway 18 Near The Big Bear Dam. Expect Delays In This Area!
DETAILS: [Click Here]

We get notices all the time for drone inspections with SCE. They use thermal imaging to find any areas of high resistance, lidar for line sag, and look for any other issues. We have fire prevention and increased service reliability to gain from these inspections.

[BFA INCIDENT DISPATCH]
TRAFFIC ACCIDENT IN BIG BEAR LAKE - **(STAGE) / KNIGHT AVE & BIG BEAR BLVD BIG BEAR LAKE
DETAILS: [Click Here]

BVES was doing the drone thing a couple years back on gilner point, identifying places where branches could touch the lines, followed by treemen clearing branches or sometimes whole trees. I had a dead tree right next to my house within reach of the supply line from the transformer, they took it down free of charge, you have to fill out a form online when they do it, but thats all, very easy...