The stream is about 20 miles long, getting its start in Berks County before it empties into the Lehigh River in Allentown. This is a classic limestone stream with excellent opportunities for the fly fisherman.
Hatches are plentiful though most of the fishing season.
Both areas offer excellent fishing. Because of the many springs which feed it, water temperature barely exceed 68 degrees even on the hottest of summer days. The water is very clear, making fish very easy to spot. Sight fishing is easy due to the clarity of the water. Fly hatches start with the Little Blue Wing Olive in early March and continues to hatch at various times though out the season.