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USGS Daily Statistics for the Nation

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 50049100 RIO PIEDRAS AT HATO REY, PR


San Juan Municipio, Puerto Rico
Hydrologic Unit Code 21010005
Latitude  18°24'34.38", Longitude  66°04'09.60" NAD27
Drainage area 15.2  square miles
Gage datum 16.4 feet above NGVD29
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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 1971-10-01 -> 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 39 36 48 30 66 48 25 40 63 47 66 51
2 35 29 40 27 61 50 42 54 61 67 58 61
3 39 30 33 47 63 52 31 79 63 53 70 71
4 33 39 29 36 49 51 33 46 48 53 94 58
5 57 77 33 47 35 43 39 53 70 50 90 62
6 56 53 31 34 40 32 35 41 107 55 61 44
7 49 33 35 37 58 35 75 38 69 59 96 43
8 37 30 25 40 86 35 39 37 46 85 111 49
9 42 30 29 30 88 58 48 49 84 55 96 48
10 57 27 29 33 78 68 40 52 178 81 72 83
11 45 33 33 36 56 35 66 44 103 65 58 74
12 38 29 40 46 61 38 49 58 71 54 68 48
13 41 27 37 36 50 32 63 41 48 63 116 40
14 58 35 31 41 59 36 59 78 66 82 64 58
15 84 28 29 65 61 41 42 58 85 72 101 58
16 43 33 26 51 38 33 73 64 85 83 72 64
17 38 29 24 57 36 35 39 78 66 68 73 44
18 40 43 26 52 42 33 43 58 133 56 108 43
19 39 37 32 45 33 58 37 44 84 53 63 37
20 47 40 37 53 72 38 68 139 178 71 59 41
21 39 39 30 57 74 40 66 109 125 69 83 38
22 41 31 31 62 42 32 69 108 137 92 79 52
23 49 38 45 70 104 36 53 185 95 60 56 43
24 38 31 45 54 48 53 47 100 91 56 58 41
25 42 47 44 49 61 33 53 69 64 71 51 39
26 30 34 34 52 61 28 36 44 80 64 48 51
27 31 44 28 51 80 42 56 67 59 90 46 43
28 36 35 41 51 45 35 59 48 56 92 54 54
29 35 27 71 76 52 38 58 74 61 58 47 57
30 29   43 77 45 29 69 84 63 50 64 42
31 36   29   68   49 69   73   45