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USGS Daily Statistics for Washington

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The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications. The user is responsible for assessment and use of statistics from this site. For more details on why the statistics may not match, click here.

USGS 12118400 ROCK CREEK AT HIGHWAY 516 NEAR RAVENSDALE, WA


King County, Washington
Hydrologic Unit Code 17110012
Latitude  47°21'45", Longitude 122°00'35" NAD27
Drainage area 11.2  square miles
Gage datum 559.24 feet above NAVD88
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00060, Discharge, cubic feet per second,
Day of
month		 Mean of daily mean values for each day for water year of record in, ft3/s   (Calculation Period 1955-10-01 -> 2025-09-30)

Calculation period restricted by USGS staff due to special conditions at/near site
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 21 32 30 25 18 11 7.8 4.9 3.8 4 5.1 13
2 21 32 30 25 18 11 7.6 4.9 3.7 4 5.1 13
3 21 31 29 25 18 11 7.5 4.9 3.7 4 5.1 13
4 21 30 28 25 17 11 7.3 4.9 3.7 4 5.2 13
5 21 30 28 25 18 11 7.2 4.8 3.6 4 5.3 13
6 23 34 28 25 17 11 7 4.8 3.6 4.1 5.5 13
7 26 37 27 25 17 11 6.9 4.7 3.6 4.1 6.1 13
8 31 35 26 25 17 11 6.8 4.6 3.6 4.1 5.9 14
9 29 33 26 24 17 11 6.7 4.6 3.6 4.1 5.9 16
10 27 32 28 24 16 11 6.7 4.6 3.5 4.1 6 17
11 28 31 29 23 16 11 6.5 4.6 3.5 4.2 6.3 18
12 29 31 28 23 16 11 6.4 4.5 3.5 4.2 6.8 18
13 30 30 28 23 15 11 6.4 4.4 3.4 4.2 7.3 18
14 30 29 28 23 15 10 6.3 4.4 3.4 4.2 8 19
15 29 29 28 23 15 10 6.1 4.3 3.4 4.2 8.4 20
16 27 29 29 23 15 10 6 4.3 3.5 4.2 8.3 21
17 27 30 29 23 15 9.9 5.9 4.2 3.5 4.2 8.6 21
18 27 30 30 23 14 9.8 5.9 4.2 3.5 4.2 9.2 20
19 27 29 29 22 14 9.7 5.9 4.2 3.5 4.3 9.6 20
20 27 29 28 22 14 9.6 5.8 4.2 3.4 4.4 10 20
21 27 29 28 22 14 9.3 5.7 4.2 3.4 4.5 11 20
22 27 30 27 22 14 9.1 5.6 4.1 3.4 4.6 12 21
23 28 30 26 21 13 9 5.6 4 3.4 4.6 12 21
24 29 30 26 21 13 8.9 5.5 4 3.5 4.6 13 21
25 30 30 26 21 13 8.7 5.4 4 3.6 4.6 14 22
26 30 30 26 21 12 8.5 5.3 4 3.7 4.7 14 22
27 30 29 26 20 12 8.3 5.3 3.9 3.7 4.7 14 21
28 30 29 26 20 12 8.2 5.1 3.8 3.8 4.8 13 21
29 30 28 25 19 12 8 5.1 3.8 3.9 4.8 13 21
30 31   25 19 12 7.8 5 3.8 3.9 4.8 13 21
31 32   25   12   4.9 3.8   5   21