An episode of Momo Flashback...
Back in early 1980's I attended Rio Vista Elementary in Anaheim. It was near Lincoln Ave & 57 FWY. The Santa Ana River was within short walking distance. For those unfamiliar, the river is actually divided into 2 parts, the actual river to the east and a series of large man-made lakes to the west (fed by river water). The man-made lakes are part of the water department's water works to allow the water to slowly seep down to ground water table and replenish what we pump up. These man-made lakes exist from Placentia/Orange area down to Anaheim. The man-made lakes near Placentia/Orange is leased by a company running pay lakes for fishing -- Santa Ana Riverlakes and Anaheim Lake.
In 1980-1982 the Santa Ana River segment that intersects Lincoln Ave isn't fenced. I'd walk down there after school with a spool of hand line or cheap garage-sale fishing rod and catch carp, catfish, sunfish, and occasional trout on canned corn. I suspect the trout is from either pay lake stockings, or DFG stockings from Prado Regional Park in Chino. Whenever they release water the fish gets washed downstream. If you walk south along the riverbank (from Lincoln Ave area), after 1 man-made lake, there's a larger one that's created by a gravel pit operation.
The western river bank on the way to the gravel pit area used to be a public trail, but they closed it due to lack of funding and trash left by people. However parts of the trail still remains, there's a paved bike route, as well as a dirt path with broken irrigation system and many plants put there over 30 years ago, including some apricot trees that are still alive and well today producing very good apricots. I've heard that there are plans to redevelop the area into a public park, we'll see what happens. WARNING: If you sneak in there and get caught by the patrols today, you'll get a trespassing ticket.
It's said that when archaeologists found an ancient Sumerian tablet, they worked for months to decipher it. And when they finally translated the many-thousand year old tablet, it was the writings of an old man complaining about "whatever happened to the good old days". While we could look back at the 1980s and ask whatever happened to the simpler days, someone in 1980s was probably moaning about the same and missing the "good old 1950s" and so on. Time marches forward and we just have to deal with the changes.
p.s. In 1980s we had some nut cases who were putting needles into Halloween candies.