Detroit Lake fishing
I'm new to this, but thought I'd toss in. Went to Detroit lake 04-08-2011. We launched at Mongold and trolled towards Piety island and the Santiam Arm. Used "wedding-ring" style spinners (made them ourselves) tipped with nightcrawlers and one with "GULP" brand maggots/grubs. We used between 1/2 oz and 3/4 oz bananna weights. I would further describe tackle and conditions, but I just don't think the fish cared as long as there was a worm involved.
We started getting a few strikes in 50-70 feet of water along the midpoint of Piety Island. Finally landed a couple of Hatchery trout. Got more strikes and more trout as we neared the Detroit Flats Day Use Area. We trolled further up the Santiam Arm and caught a few here and there, water depth didn't seem to matter, but we seemed to have better luck in shallower water (20-40'). The hatchery trout were skinny; they all went home with one person for smoking.
Water temperature was about 45.5 degrees (cooler at the boat launch).
I had been using the GULP brand "maggots" or grubs to tip my hooks and only had one hit that I noticed, so I switched to worms and started catching fish. One of those fish was a 12.5" trout that seemed to have been in the lake for some time. It was noticeably fatter than the other trout (did I mention they were skinny? They were skinny) and its flesh was a satisfying pink/salmon color.
One of my partners hooked a 12.5" Kokanee just off the Detroit Flats area, so I put a second rod (gotta love that 2-rod endorsement!) in the water using a downrigger and fishing at about 20 feet with a dodger and hoochie (actually a mini-tube) rig. I got two trout on the downrigger (strangely enough, the lure was tipped with GULP maggots). The 12.5" kokanee was in good shape; seemed chunky and its meat was nice and pink. We caught two smaller kokanee (one about 10 inches, the other about 9") which didn't have much color to them. We tossed back one even smaller kokanee (7"?). All the kokes were caught with the spinner/worm combo.
We caught our limits (5 each for three anglers) in a 4 or 5 hours of fishing. It would have taken less time if we hadn't trolled from the boat ramp to the flats area where we caught the fish. The fish finder showed scattered fish in the arm, with a few concentrations along the steep shore area across from the flats in the Santiam arm. We anchored and tried worms and power bait where we saw one concentration in about 30' of water, but only had one trout and a few nibbles.
I have heard that the best place this time of year for kokanee is at the log boom by the dam. I haven't tried it, yet. In decades past I have actually caught kokes FROM the dam and seen them caught. In the past I have seen them close to 16". That was decades ago, but it seems the potential is there, especially with a 12.5" fish this early in the year.
Next trip will probably be to Green Peter.