Greenfield Mills Reservoir

The downstream reservoir at Greenfield Mills, Indiana, was also badly damaged by the 1998 Event, and while the reservoir is benefitting from the upstream work (by the removal of sediment that otherwise would, over time, have migrated downstream) any extensive restoration activities in the reservoir face large practical and budgetary difficulties.

Greenfield Mills Reservoir prior to Event

Greenfield Mills Reservoir prior to Event

Greenfield Mills Reservoir after Event

Greenfield Mills Reservoir after Event

Traditional excavating techniques are impracticable as the quantity of wet, heavy, mud exceeds 75,000 CY—or about 6,250 dump truck loads of material. Attempting to excavate, and then haul 6,250 truck loads of heavy wet material to an off-site disposal is not possible.

One plausible method is hydraulic excavation and on-site disposal. This would use suction dredging and pumping a slurry to dewatering and disposal pits. The pits must be very near to the work or, again, the method becomes impracticable with distance. This means the scope of activities in Greenfield Mills reservoir will depend entirely upon whether a suitable amount of nearby land can be made available for dewatering and disposal pits.

Operations in Greenfield Mills reservoir are
 projected to begin 2014-15, assuming that the Trust is able to secure adjacent land for infiltration pits to process the excavated materials.

All options continue to be evaluated for meaningful improvement to the Greenfield Mills reservoir.