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<br />002120
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<br />GEOLOGY OF THE VICINITY OF .A PROPOSED DAM
<br />SITE NEAR STRAWN, COFFEY COUNTY, KANSAS
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<br />JOHN M. JEWE.Tr, State Geological Survey of Kansas
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<br />The axis for a proposed dam on Neosho river near Strawn extends
<br />from a point in the N\VJA of sec. 22, T. 20 S., R. 14 E., to a point in
<br />the SW1;4 of sec. 29, T. 20 S., R. 14 E. The direction of the axis
<br />measured at the first point is approximately S. 430 30' W. The
<br />length of the axis is about 12,000 feet. The axis crosses Kansas
<br />highway 57 at a point which is approximately 2 mites north of
<br />Strawn and it crosses the M. K. and T. railway at a point which is
<br />approximately 1JA miles northwest of Strawn. The location is shown
<br />on a map in Figure I which ~hows also the locations of test holes
<br />which were dril!ed under my supervi~ion. The field work was done
<br />in July, 1942.
<br />This report is based chiefly on data which were obtained through
<br />study of cores and cuttings from ten test holes dril!ed along the dam
<br />axis. The report is the result of a preliminary survey and is not
<br />intended to be a guide for designing a dam, but rather to be a re-
<br />port on the general geological conditions and as an aid in determin-
<br />ing the feasibility of planning construction.
<br />The trench of Neosho river in this part of Kansas is eroded in
<br />rocks of the Shawnee group of Pennsylvanian age. The bed rock is
<br />shale, limestone, and a minor amount of sandstone. The river's
<br />trench is approximately 2 miles wide and 120 feet deep. The lower
<br />approximate 45 feet is filled with al!uvium, chiefly fine sand .and
<br />clay, but in part coarse flint gravel. From information at hand it
<br />is believed that the deepest part of the stream valley is near its
<br />south wall. The river flows in a general southeastwardly direction.
<br />Its gradient is about 5 feet per mile (measured parallel to the valley
<br />walls and not along the actual channel which meanders rather
<br />broadly) .
<br />The uplands on each side of Neosho river are maturely dissected.
<br />Streams tributary to the river enter the larger stream at grade.
<br />Coarse flint gravels of probable Tertiary age partly cover the up-
<br />lands to a depth of several feet. The uplands are largely covered
<br />with native bJuestem grass, but nearly al! of the area of the river's
<br />flood plain is under cultivation.
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