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<br />ANNUAL REPORT - 1998
<br />TRIBUTARY RESERVOIR REGULATION ACTIVITIES
<br />(AUGUST 1997 - JULY 1998)
<br />NORTHWEST DIVISION
<br />MISSOURI RIVER REGION
<br />OMAHA DISTRICT
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<br />I. PURPOSE AND SCOPE..,...,.........,.."..,...,.,....,.........,..,.,..,..,..........,..,.........1
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<br />II. REFERENCES.............,.,..............,............................,......,.,.....,........,....,.. 1
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<br />III. RESERVOIRS IN THE OMAHA DISTRICT .................................................... 1
<br />a. Reservoirs with Flood Control Storage ................................................ 1
<br />b, Reservoirs without Flood Control Storage ................,......,.............,..... 1
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<br />IV. TRIBUTARY RUNOFF AND FLOODS ...,...,.........,............,......................,.... 4
<br />a, General Hydrologic Conditions ........................................................... 4
<br />(1) Long-Term Trends ...................................,.............................. 4
<br />(2) Rocky Mountain Snow MeIL,...,.........,..............,....,....,...........7
<br />(3) Glacial Lakes ..Flood........,......,..,....................,..,....,....,..,........7
<br />b. Weather Events, August 1997 through July 1998..........,.................... 8
<br />(1) Late Summer 1997...............,......................,.,................,...... 8
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<br />(2) Fall ....,.,...,..,...".,."...,.,.,......,...,..,..,..,.,.,.",.,.,.,............".,..,9
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<br />(3) Winter......................................,....................,..,..,...............11
<br />(4) Spring 1998..........,.......,......................,.........,....,...............12
<br />(5) Early Summer 1998....,.......,.........,...................................,...15
<br />c. Nishnabotna River Flood, June 14-19, 1998.................,..............,.....17
<br />d, Runoff Into Tributary Reservoirs ..,.................................................,..26
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<br />V. RESERVOIR ACCOMPLISHMENTS.....,.,.,.......,...,.....................,............... ..34
<br />a, Flood Damages Prevented..................,...,........................,................34
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<br />b. Recreation Usage..,........,...,............................,.,............,........,.,...., 34
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<br />VI. RESERVOIR OPERATION .......,....., ...................... ......... ....,.......,............. ,.44
<br />a. Previous Years Operation (August 1, 1997 through July 31, 1998) ......48
<br />(1) Corps of Engineers Lakes ..................................................,...48
<br />(a) Tri-Lakes Operation ............................................,.... ,., ..49
<br />(b) Cherry Creek Reservoir, Colorado Normal Operations ..,....50
<br />(c) Papillion Creek Basin, Nebraska .....................................50
<br />(d) Salt Creek Basin, Nebraska ................,...............,......,...50
<br />(e) Bowman-Haley, North Dakota .......................................50
<br />(f) Pipestem, North Dakota ................................................50
<br />(2) Bureau of Reclamation Dams ...........................,.....................61
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