The Gilsizer Slough is part of the drainage system for Yuba City
and runs south from there through Sutter County.
The Gilsizer Slough Quadrangle boundaries are:
N 39º 00’ 00” and N 39º 7’ 30”
W 121º 37’ 30” and W 121º 45’ 00”
The United States Geological Survey (USGS) has many missions. At
one time, a major mission of the USGS was the supplying of
topographic maps of the United States on several scales. Our cache
series is based on the 7.5-minute quadrangle series.
The term quadrangle is used, instead of quadrilateral or rectangle,
because the sides of these blocks are curved. The USGS divided the
United States into quadrangles that are 7.5 minutes by 7.5 minutes.
Since a degree is divided into 60 minutes, a quadrangle one degree
by one degree contains 64 of these quadrangles. The USGS also
produced a 15-minute series, but that’s another story.