A diversity of rare mussels and insects inhabit this 4.2 mile stretch of the Wisconsin River along its northern shore.  These include the state-threatened rock pocketbook (Arcidens confragosus), monkeyface (Quadrula metanevra), and wartyback (Q. nodulata), and the federally endangered Higgins’ eye (Lampsilis higginsii). Rare invertebrates include the smoky shadowfly (Neurocordulia molesta), elusive clubtail (Stylurus notatus),…