The use of controlled low strength material (CLSM), also known as flowable fill, has dramatically increased throughout the State of Colorado over the last eight years. This paper will outline the various uses of CLSM, mix designs, construction procedures, and problems encountered. Some specific uses that will be included are the filling below abandoned bridges in-place, filling an abandoned pipeline under Interstate Highway 70, backfill against a foundation of a large commercial warehouse, and other interesting uses.