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USGS Daily Statistics for Puerto Rico

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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 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 40 37 48 30 66 48 25 40 63 47 65 52
2 35 29 40 27 61 50 42 54 61 67 58 62
3 39 30 33 47 63 52 31 79 63 53 71 72
4 33 40 29 36 49 51 33 46 48 53 96 58
5 55 79 33 47 35 43 39 53 70 50 83 63
6 56 53 31 34 40 32 35 41 107 55 50 45
7 50 33 35 37 58 35 75 38 69 59 94 43
8 37 30 25 40 86 35 39 37 46 85 113 49
9 42 30 29 30 88 58 48 49 84 55 97 49
10 58 27 29 33 78 68 40 52 178 81 70 85
11 46 33 33 36 56 35 66 44 103 65 54 75
12 39 29 40 46 61 38 49 58 71 54 68 49
13 42 27 37 36 50 32 63 41 48 63 118 40
14 59 35 31 41 59 36 59 78 66 82 64 58
15 86 28 29 65 61 41 42 58 85 72 102 59
16 43 33 26 51 38 33 73 64 85 83 73 65
17 38 29 24 57 36 35 39 78 66 68 73 44
18 40 43 26 52 42 33 43 58 133 56 109 42
19 39 37 32 45 33 58 37 44 84 53 64 36
20 48 40 37 53 72 38 68 139 178 71 60 41
21 40 39 30 57 74 40 66 109 125 69 85 39
22 42 31 31 62 42 32 69 108 137 92 81 53
23 49 38 45 70 104 36 53 185 95 60 57 43
24 39 31 45 54 48 53 47 100 91 56 58 42
25 43 47 44 49 61 33 53 69 64 71 52 40
26 30 34 34 52 61 28 36 44 80 64 48 51
27 31 44 28 51 80 42 56 67 59 90 47 43
28 36 35 41 51 45 35 59 48 56 92 55 53
29 36 27 71 76 52 38 58 74 61 58 47 58
30 30   43 77 45 29 69 84 63 51 65 43
31 37   29   68   49 69   55   46