Abstract: A precast concrete catch basin is provided with an integral transverse gutter inlet shaping form across the front. The form is spaced from the top slab of the catch basin and forms therewith a gutter inlet for the passage of water into the catch basin. The transverse form is arcuate in shape and serves as a form and top surface for a concrete gutter inlet cast against it. Anchor bolts are provided in the side walls of the catch basin and extend outwardly through the transverse form into the area of the concrete gutter so as to secure the inlet shaping form to the side walls and to anchor the catch basin to the gutter after the gutter has been cast in the field against the transverse gutter shaping form.