Operational Plan for the Restoration of Diadromous Fishes to the ...

eaver flowage and Sanborn Stream provide a hydraulic connection suitable for fish
passage.
The beaver flowage water elevation is presently controlled by the breached
outlet of the dam and is the part of the Wangan Brook drainage that comes closest to the
Sanborn watershed (Figure 6). All low-lying areas that might conduct water between
the beaver flowage and Sanborn Brook throughout this area were walked in July
immediately following an extended period of heavy rains that temporarily resulted in
near-spring stream runoff conditions. Several small ephemeral tributaries were
observed to flow into the Sanborn drainage from the direction of the beaver flowage,
but were confirmed to have no direct hydraulic connection to the beaver flowage. A
slight height of land between the drainages was observed that divides the existing
beaver flowage from the nearest stream head by approximately 250 ft. (Photo 6). It is
apparent by examination of undisturbed leaf litter, vegetation and forest duff across this
height of land that this watershed divide has not recently been subject to inundation, and
thus is not a connection that migrating fish can utilize to cross between watersheds.
Figure 6: Location of Beaver Flowage Relative to Sanborn Brook, Wangan Brook and
Governing Topographic Features (Red Line Indicates Partial GPS Track During
Survey)
15