USGS Scientific Investigations Report 2010–5016 Development of an Environmental Flow Framework for the McKenzie River Basin, Oregon

Table 12. Pre- and post-dam flood statistics for McKenzie River, Oregon.

[Flood statistics computed from annual peak streamflow data based on the Bulletin 17B Log Pearson III method (Interagency Advisory Committee on Water Data (1981). Abbreviation: ft³/s, cubic feet per second]

Streamflow-gaging station No.	Streamflow-gaging station description and study reach No.	Recurrence interval(years)	Pre-dam period		Post-dam period		Percent change
Streamflow-gaging station No.	Streamflow-gaging station description and study reach No.	Recurrence interval(years)	Period of record (water years)	Streamflow(ft³/s)	Period of record (water years)	Streamflow(ft³/s)	Percent change
14159000	McKenzie River at McKenzie Bridge	2	1911–62	6,392	1963–94	6,231	-2.5
	Reach 1	10		11,380		10,500	-7.7
		50		16,060		15,090	-6.0
		100		18,120		17,290	-4.6
14159500	South Fork McKenzie River near Rainbow	2	1946–63	9,242	1964–2008	4,262	-54
	Reach 3	10		19,070		6,506	-66
		50		29,510		7,946	-73
		100		34,430		8,451	-75
14162200	Blue River at Blue River	2	¹1936–65	5,869	1969–2008	3,272	-44
	Reach 5	10		11,110		4,071	-63
		50		16,790		4,525	-73
		100		19,520		4,677	-76
14162500	McKenzie River near Vida	2	1925–62	28,740	1963–2008	17,210	-40
	Reach 7	10		40,320		27,400	-32
		50		63,510		37,060	-42
		100		69,970		41,390	-41

¹Annual peak streamflow data from the pre-dam flow gage: 14162000.