Watershed Conservation Plan - Destination Erie

Figure 5.8. Flow per square mile persisting 80% or more of the time for selected streams in the study
area (after Managan et al. 1952).
Figure 5.9. Seven-day, 10-year, low-flow per square mile for selected streams in the study area (after
Buckwalter et al. 1996).
Creek flows over a buried valley thought to be the original outlet of Conneaut Creek that was filled with
glacial drift and outwash materials.
A similar situation may account for apparently well-sustained flow in Mill Creek (see Figures 5.7–5.9).
Inspection of a county-scale topographic map of Erie County and mapping showing the geographical
distribution of glacial deposits indicates the likelihood that a prehistoric river valley extended from the area
of Waterford toward Lake Erie, along the line of present day Rt. 97. The line of that valley is interrupted by
glacial deposits that form a ridge of drift material extending parallel to the lake at a position just north of I-90.
It is suggested that a buried valley lies beneath this ridge, which also serves as the "divide" between the Mill
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