ANIMAL ECOLOGY OF JOHNSON COUNTY 11 
Union, and Sharon townships, together with the north part of 
Washington, the southwest corner of Lucas, and all of Pugs 
save the southern eight sections. 
From the north and east the Iowa River receives the run-off by 
means of a number of small streams, several of which are of suf- 
ficient size and constancy to have been given names. The first 
is known as Knapp Creek, which has its origin just outside the 
northwest corner in Linn County and drains the most of Monroe 
township. McAllister Creek also has its origin in Linn County 
and flows through Jefferson township, emptying into the river 
about seven miles below the mouth of Knapp Creek. Lingley’s 
Creek, the next in order, drains the northeast third of Jefferson 
and the northern half of Big Grove townships. A short distance 
below are found Mill Creek and Jordan Creek, which unite with- 
in a half mile of their confluence with the river. These creeks 
drain the west edge of Cedar and the south half of Big Grove 
townships as well. Below these are two very short streams 
known as Silver’s Creek and Mud Creek respectively. Their 
basins lie wholly within the northwest portion of Newport town- 
ship, the rest of which is drained by Turkey Creek, Saunder’s 
Creek, and Rapid Creek. Saunder’s Creek is really a tributary 
of Rapid Creek, as it joins the larger stream about a mile from 
its mouth. Rapid Creek is the largest tributary of the Iowa 
River within the county from the east or north. It rises near 
the east edge of the county in Graham township, which it drains 
before entering Newport township. Ralston Creek drains the 
northern part of East Lucas township and wanders in its course 
through Iowa City, emptying its water into the Iowa at the south 
boundary of the corporate limits. Snyder Creek drains the west 
half of Scott township and crosses the southeast corner of East 
Lucas and the northwest corner of Pleasant Valley townships on 
its way to the river. Below this Buck Creek and Otter Creek 
drain the west half of Lincoln and the lower part of Pleasant 
Valley townships. Fremont township, low-lying, level, and of a 
general sandy nature, is drained by a number of intermittent 
streams not herein named. 
