Glad you guys had fun.
Cultus has several areas to dive, each with their own appeal (if one likes this sort of thing):
Where you were is just south of the Main beach area, it has a shallow sloping profile and, of course, boat hazard.
The next stop heading south is Entrance bay. There is a no boating zone so supposedly you might be safer (all bets off on a summer weekend). Off the beach it drops swiftly to about 65' or so. If you dive off the docks you can follow the contour south/north. Usually there are 3 to 4 species of small fish there. If you dive north of the northern dock you will hit 80' or so in the small bay. Across the bay is the site of an old mairina and if you cross over you will see all sorts of debris.
The next stop of interest is Spring bay, just a little south of Entrance. It is a nice little bay that bottoms out at about 45' and is full of bottles and golf balls (I guess someone really likes whacking them off from the shore there?). Lots of sculpins there as well as they often nest in the brown stubbies.
If you have access to a boat, across the lake at its southern end are some cliffs that people like to jump from. That's where I shot my crayfish video. A series of walls to 135' that I would like to spend a lot more time exploring.
Lastly, across the lake (no shore access) from entrance bay is an area of DND property. Urban legend has it that (depending on the story) jeeps, trucks, tanks and/or a bailey bridge have been disposed of there over the years. The search continues...