Abstract: A grate attachment fixture is disclosed which rotationally engages a locking bar with the opposed sidewalls of a drainage channel and which thereafter secures a grate to the drainage channel. The grate attachment fixture includes a rotatable connector adapted to adjustably interconnect the locking bar and the grate. The grate attachment fixture also includes a grate securing member affixed to the locking bar. The grate securing member includes a pair of adjustment surfaces including a positive engagement surface for engaging a portion of the connector such that upon rotation of the connector in a first angular direction, the locking bar initially rotates within the trench in the first angular direction until the first locking bar engages the opposed sidewalls. Thereafter, the positive engagement surface cooperates with the connector to apply a tensile force between the grate and the locking bar upon further rotation of the connector.