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2025 Hazard Mitigation Plan
<br />Kittitas County, Washington
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<br />Chapter 4: Hazard Identification and Risk Assessment 127
<br />Table 4-64. Kittitas County Peak Discharges
<br />Flooding Source and
<br />Location
<br />Drainage Area
<br />(square miles)
<br />Discharge
<br />(cubic feet/second)
<br />10-Year 50-Year 100-Year 500-Year
<br />Yakima River
<br />Downstream Study Limit 1,594 20,000 29,300 33,900 45,400
<br />Wilson Creek (Upstream) 1,190 19,000 28,000 32,300 43,600
<br />Confluence with Manastash
<br />Creek 1,177 18,900 27,700 32,000 43,200
<br />Confluence with Dry Creek 1,037 18,500 27,100 31,400 42,400
<br />Confluence with Teanaway
<br />River 740 17,100 25,100 29,100 39,600
<br />Confluence with Teanaway
<br />River (Upstream) 533 14,700 21,700 25,200 34,300
<br />Confluence with Crystal
<br />Creek (Upstream) 495 14,500 21,400 24,700 33,800
<br />Confluence with Cle Elum
<br />River 485 14,200 21,000 24,300 33,200
<br />Confluence with Cle Elum
<br />River (Upstream) 263 7,990 11,700 13,500 18,400
<br />Confluence with Big Creek
<br />(Upstream) 229 7,220 10,600 12,200 16,600
<br />At Easton 188 6,580 9,660 11,200 15,200
<br />Confluence with Cabin Creek
<br />and Kachees River
<br />(Upstream)
<br />122 4,900 7,180 8,290 11,300
<br />Confluence with Cabin Creek
<br />(Upstream) 82.1 3,740 5,480 6,300 8,600
<br />Upstream 74.8 3,460 5,060 5,840 7,900
<br />Kachees River
<br />Kachees River at Mouth 64.0 2,300 3,360 3,860 5,180
<br />Silver Creek
<br />Silver Creek at Mouth 6.1 260 370 425 560
<br />Cle Elum River
<br />Cle Elum River at Mouth 222 8,020 11,800 13,600 18,600
<br />Upstream 203 7,540 11,100 12,800 17,400
<br />Manastash Creek
<br />Downstream 87 1,400 2,000 2,010 2,700
<br />Confluence of Manastash
<br />and North Fork Manastash
<br />Creeks
<br />69.7 1,240 1,780 2,040 2,670
<br />Upstream 42.8 967 1,400 1,590 2,100
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