Isopipe end flow dam

The disclosure relates to apparatuses for producing a glass ribbon, the apparatuses comprising a forming body comprising an upper trough-shaped portion comprising two trough walls and a trough bottom; a lower wedge-shaped portion; a delivery end configured to receive molten glass; and a compression end comprising a curb; and an end cap coupled to the compression end and extending over a top surface of the curb, wherein a height of the curb is greater than a height of the two trough walls at a point proximate the compression end. Also disclosed herein are methods for producing a glass ribbon using such apparatuses.