Because of the frequency with which I netted and electrofished Speedwell over the course of 39 yrs, I have serious doubts that the large trout came from the lake or spent much time there. While we occasionally captured a trout in the gear, they were always recently stocked fish from Hammer and never a wild fish. On the other hand, our sampling never took us up lake any closer to the Speedwell Forge Rd crossing than perhaps 200-300 yds, so it is possible that trout utilized the very upper end of the lake on a seasonal basis. I believe that lower Hammer just above the lake and for some distance above there used to get warm in the summers and certainly the upper lake got warm.
In 1986 gizzard shad were introduced to Speedwell (to enhance crappie growth) and their numbers exploded, annually producing good year classes. If the YOY were not too large by fall and winter, it is possible that some in the upper lake or even in the Speedwell Forge Rd area could have been utilized by brown trout, as YOY gizzard shad can provide great forage. (Gizzard shad occasionally enter the very lower ends of trib creeks in good numbers). The problem typically is, however, that they grow so fast that they often rapidly exceed the capabilities of predatory fishes’ gapes. They also can predominate the fish biomass in a lake and can negatively impact bluegill growth, so they are only to be used with great caution. In the Speedwell case, however, bluegill were already stunted. Trout do readily feed on them when they are of the appropriate size, as seen at Lancaster Co’s Muddy Run Recreation Lake.