Yes, it is fishable, and yes, there are fish there. This is a "clean water reservoir" maintained by the
Upper Occoquan Service Authority (Formerly Sewage Authority). A $10 UOSA Permit is required which can be purchased at the office on site, and a valid VA Freshwater Fishing License is also required. For many years, this was my primary Carp Fishing Destination, and I caught many, many good carp there. In fact, I probably learned more about stalking and sight-casting to carp, and about their shallow water/feeding behaviors in that reservoir than any other place. My largest fly rod carp to date (47 inches) was there in May of 2006.
Only a small portion of the West Bank is accessible, from the parking area around to the chain link fence of the treatment plant. The shallows along this bank used to produce some outstanding sight casting opportunities. However, several years ago the UOSA lined the entire bank with large rocks to prevent or slow erosion. Immediately after this modification, I very seldom found carp feeding along it any more. They used to dig under the bank, extracting all sorts of bugs and grubs, and now they no longer can. With many miles of inaccessible shoreline all along the other side of the reservoir, I imagine they now feed over there, out of reach with no boat access allowed. I have not purchased a permit or fished it since, but from time to time I pull in there and walk the bank, hoping to find the carp back in the shallows. Perhaps it's time to check again.
Aside from the carp fishing, I have targeted and landed several nice Bass in there, and for many years this was my main local haunt, a place to hit when I only had an hour or so. As long as the wind is to the West, and you are facing the water, you hardly even notice your fishing next to a treatment plant. If you go, let us know how you do.
Dan Davala
P.S. The geese LOVE the fields there, so choose your footwear wisely!