USGS Scientific Investigations Report 2009–5123Hydrology of the Johnson Creek Basin, Oregon

Table 3. Annual peak streamflow and volume, Johnson Creek, Oregon, water years 1990–2006.

[Map numbers are shown in table 1. Percentage change and period of analysis: (a) not computed due to different storm event; (b) one or more daily mean streamflow estimated. Abbreviations: ft³/s, cubic foot per second; mi², square mile]

Water year	Johnson Creek at Sycamore (map number 30), drainage basin area 26.8 mi²		Johnson Creek at Milwaukie (map number 41), drainage basin area 53.2 mi²		Percentage of change in annual peak streamflow from Johnson Creek at Sycamore to Johnson Creek at Milwaukie	Period of analysis for volume computation	Percentage of change in volume over annual peak storm event (6 days) from Johnson Creek at Sycamore to Johnson Creek at Milwaukie
Water year	Date	Peak streamflow(ft³/s)	Date	Peak streamflow(ft³/s)		Period of analysis for volume computation
1990	01-10-90	860	01-10-90	892	4	Jan. 6–11, 1990	16
1991	02-20-91	1,130	02-20-91	1,030	-9	Feb. 20–25, 1991	7
1992	12-06-91	1,120	12-06-91	1,010	-10	Dec. 5–10, 1991	14
1993	12-10-92	825	12-10-92	799	-3	Dec. 8–13, 1992	16
1994	02-24-94	1,600	02-24-94	1,730	8	Feb. 23–28, 1994	32
1995	11-01-94	1,300	11-01-94	1,400	8	Oct. 31–Nov. 5, 1994	24
1996	02-07-96	2,350	02-08-96	2,170	-8	Feb. 5–10, 1996	19 (b)
1997	11-19-96	2,550	11-19-96	1,940	-24	Nov. 18–23, 1996	16 (b)
1998	01-14-98	854	01-14-98	1,030	21	Jan. 12–17, 1998	23 (b)
1999	12-28-98	950	12-28-98	1,140	20	Dec. 27, 1998–Jan. 01, 1999	25
2000	11-26-99	664	11-26-99	840	27	Nov. 24–29, 1999	30
2001	10-01-00	258	03-28-01	278	(a)	(a)	(a)
2002	01-25-02	632	01-25-02	782	24	Jan. 24–29, 2002	29
2003	01-31-03	1,820	01-31-03	1,670	-8	Jan. 29–Feb. 3, 2003	25
2004	12-13-03	1,140	12-14-03	1,530	34	Dec. 13–18, 2003	40
2005	03-27-05	447	03-27-05	682	53	Mar. 26–31, 2005	38
2006	12-30-05	1,150	12-30-05	1,540	34	Dec. 27, 2005–Jan. 1, 2006	32