Urban Stream Monitoring

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Beginning in April of 2001, staff of the Water and Pollution Control Department began periodic monitoring of the five major urban streams in Ames for fecal coliform bacteria.  Monitoring takes place approximately every month during the warm weather months of April through October.  If obvious signs of pollution are discovered, or if significant degradation is observed, City staff will conduct more detailed water quality investigations.  The results of the ongoing City monitoring are shown below.

 Sample Date   Skunk River  Squaw Creek  Clear Creek  College Creek  Worle Creek    
October 12, 2017
350
 1800  620  600  1040
September 21, 2017
 135  940  --- 1100
 ---
August 8, 2017
105
530
---
 4900 ---
July 12, 2017
250
 1000 475
2600
760
June 13, 2017
410
 630  800  2000 1500
May 23, 2017
 470 360
560
630
 540
April 20, 2017
 1800  22000 290
250
 200
October 4, 2016
470
 390  400 500
450
September 27, 2016
600
 500 630
90
 1300
August 9, 2016
160
740
420
2300
---
July 21, 2016
1200
5200
 1200 1500
10000
June 9, 2016
420
490
150
1800
700
May 19, 2016
120
140
40
460
400
April 14, 2016
57
170
100
300
40
September 1, 2015
1900
700
730
690
600
August 11, 2015
4000
4800
1700
2900
16000
July 14, 2015  170  600 1900 2300 1800
June 2, 2015
310
320
230
1100
270
May 19, 2015
160
290
450
580
280
April 14, 2015 20 200 66 2600 210
October 21, 2014
160 220
130 3000
360
September 4, 2014  470 1100 560 600 1400
August 5, 2014 220 210 1500 3500 ---
July 22, 2014 180 220 1800 3300 1700
June 3, 2014 1500 540 470 1800 350
May 6, 2014 54 60 18 260 90
April 22, 2014 43 23 70 50 36
October 1, 2013  --- --- --- --- ---
September 12, 2013 160 --- --- --- ---
August 1, 2013 150 380 --- --- ---
July 16, 2013 100 270 1800 4100 700
June 13, 2013 370 380 420 900 570
May 21, 2013  6100 1000 590 2800 4200
April 23, 2013 140 160 110 90 1000
October 11, 2012 10  ---  --- 190  ---
September 5, 2012 500 33000  --- 75000 68000
August 9, 2012 680 8000 5000 2000 2200
July 19, 2012  40 200 210  ---  ---
June 5, 2012 74 120 130 760 310
May 17, 2012 110 200 130 1100 240
April 17, 2012 470 2800 230 440 2700
October 18, 2011     300 660  --- 600 ---
September 13, 2011 150 310  --- 1500 ---
August 25, 2011     69 170 360 640 ---
July 21, 2011     130 5200 9000 72000 2000
June 14, 2011     700 1300 3200 520 680
May 19, 2011             110 260 120 610 420
April 13, 2011            27 37 46 170 26
October 7, 2010 130 390 270 1000 650
September 23, 2010 700

800

600 1100 17000
August 19, 2010 620 240 1300 1100 300
July 20, 2010     5500 6500 1000 1900 21000
May 29, 2010 120 580 240 1100 290
June 10, 2010     420 490 510 1900 2100
April 22, 2010     52 76 80 460 56
October 13, 2009 90 150 2800 435 170
September 17, 2009 200 480 1180 - -
August 20, 2009 800 2800 4100 6300 4400
July 16, 2009 700 800 6200 2200 1200
June 23, 2009 1700 1200 1300 700 2500
May 27, 2009 14800 25600 3100 3300 >40000
April 15, 2009 70 120 10 90 90
     
   

 Samples are analyzed using the Membrane Filter Technique (SM 9222 D).  The results of testing for fecal coliform when using this method are expressed in terms of the number of Colony-Forming Units (CFU) present in a 100 milliliter sample. 

"Coliform density, together with other information obtained by engineering or sanitary surveys, provides the best assessment of the sanitary quality of water."  -- Standard Methods for the Examination of Water and Wastewater.