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orv Fe n <br />xesults <br />• Oxygen values in the lcorth Fort, from Aprit to November xere general]~• high, <br />ranging from 7.4 to 12.7 mg~l. Considering differences in collection time from <br />station to station there did not appear to be any sicni."ic.nt differences betkeen <br />stations. Generall;,• higher values for the upper two stations is believed to be <br />the result of greater av}•gen productior. by river z?gae later in the morning. <br />Ox}•gen values in 1{innesota CreeY, were also high and would not significantly in- <br />fluence the 1;orth Fort. based on September - t;ove,:rber data. <br />Cor.,oG risors <br />O~;;gen cencentraticns found during the .'.rril to Pctober periods were scr:ewhat <br />loMer in range but genera~?y sic~ilar to previous data for similar ti:~ peri rs. <br />Aside from a diurnal low oxygen concentration of 4.; c`g~l durinE, the previous <br />• summer, oxygen concertratiors in the Pac.•iia area have been recorced as lc:+ as 7.2 <br />mg~l. <br />Simi"icance <br />Tk:ere is no indication of arry concern for oxygen values lisl:.ting a.~catic life <br />in the North Fork based on the oxygen data co?lected. A11 values obtained were <br />above the existing state g~,ude7..ines oS 6 mg~l Sor class B-1 waters. Hoxever, it <br />is probable that late night or earl,} morning dissolved oxygen values are someticjes <br />below 6 mg~l because of algal respiration during summer and early fall periods. <br /> <br />3-10 <br />