This paper, in part, represents results of a study supported by North Finn, a small oil an gas producer. It includes 13 Muddy Sandstone waterfloods located in the Northern Powder River Basin of Wyoming. The value of the study to the on-going North Carson Muddy Unit Flood is also discussed.

Fluvially deposited lower Muddy Sandstone reservoirs of early Cretaceous age have never been successfully flooded in the area. Upper Muddy sandstones deposited in marine dominated environments had varying degrees of success. North Finn's proposed flood was in a lower Muddy, fluvially deposited reservoir. Detailed study of the earlier waterflood failures encouraged North Finn to take certain precautions which have led to the first successful flood of a lower Muddy Sandstone in this area.

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