Hallo is survived by his wife, Leah; his 12-year-old daughter, Megan; his parents, Edwin Sr.
Hallo was described as an avid outdoorsman, as well as a craftsman much admired for his work and honesty by longtime customers.
The Hallo brothers were on a family camping trip to Lake Isabella, but were the only family members at South Creek Falls when the accident happened, Mayer said.
A preference for firm ground resulted in Hallo Dandy being sent out early the following season, and he scored at the first time of asking in August, in a handicap chase at Market Rasen, ridden by Billy Beardwood.
HALLO DANDY proved to be one that got away for Grand National legend Ginger McCain, who in 1977 - the year Red Rum won his third National - was sent the future Aintree hero as an unbroken three-year-old, writes Andrew Scutts.
McCain saddled Hallo Dandy four times in novice hurdles without success, before switching him to fences aged five.
Hallo Dandy scored on his return at Ayr, and the same course was used for his Grand National warm-up, three weeks before his career-defining victory.