Abstract: A waterslide amusement device includes an inclined slide course fabricated from a plurality of straight and curved flume modules connected together in an end to end relationship. The modules, which are preferably molded as a unitary structure from a fiberglass reinforced resin, have a flange formed at each end which extends outwardly from the sides of the module in a plane transverse to the module with spaced openings through each flange. A plurality of support plates associated with each pair of adjacent flanges have a plurality of openings therein adapted to align with a portion of the aligned openings of respective flanges of adjacent modules whereby the support plates are fastened to support trestles. The modules are connected together by securing the flanges of two adjacent modules together with suitable securing means extending through aligned openings through the flanges and to the support plates.