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Caption: The Chart above displays dissolved oxygen levels for four Klamath mainstem locations for various sampling dates in 1996. The Klamath at Copco #2 had the lowest D.O. record at 5.6 milligrams/liter. Below Iron Gate Dam the lowest D.O. recorded was 6.5 mg/l. The time of sampling as indicated in the Source Table shows that few samples were taken in the early morning hours when the lowest D.O. readings can be expected (see Shasta Topic WQ: D.O. Nocturnal/Diurnal Changes). See Info Links for more information.
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