# # U.S. Geological Survey # National Water Information System # Retrieved: 2024-05-04 10:04:44 EDT # # ---------------------------------- WARNING ---------------------------------------- # Some of the data that you have obtained from this U.S. Geological Survey database # may not have received Director's approval. Any such data values are qualified # as provisional and are subject to revision. Provisional data are released on the # condition that neither the USGS nor the United States Government may be held liable # for any damages resulting from its use. # # More data may be available offline. # For more information on these data, contact USGS Water Data Inquiries. # This file contains the annual peak streamflow data. # # This information includes the following fields: # # agency_cd Agency Code # site_no USGS station number # peak_dt Date of peak streamflow (format YYYY-MM-DD) # peak_tm Time of peak streamflow (24 hour format, 00:00 - 23:59) # peak_va Annual peak streamflow value in cfs # peak_cd Peak Discharge-Qualification codes (see explanation below) # gage_ht Gage height for the associated peak streamflow in feet # gage_ht_cd Gage height qualification codes # year_last_pk Peak streamflow reported is the highest since this year # ag_dt Date of maximum gage-height for water year (if not concurrent with peak) # ag_tm Time of maximum gage-height for water year (if not concurrent with peak # ag_gage_ht maximum Gage height for water year in feet (if not concurrent with peak # ag_gage_ht_cd maximum Gage height code # # Sites in this file include: # USGS 01646500 POTOMAC RIVER NEAR WASH, DC LITTLE FALLS PUMP STA # # Peak Streamflow-Qualification Codes(peak_cd): # 1 ... Discharge is a Maximum Daily Average # 2 ... Discharge is an Estimate # 3 ... Discharge affected by Dam Failure # 4 ... Discharge less than indicated value, # which is Minimum Recordable Discharge at this site # 5 ... Discharge affected to unknown degree by # Regulation or Diversion # 6 ... Discharge affected by Regulation or Diversion # 7 ... Discharge is an Historic Peak # 8 ... Discharge actually greater than indicated value # 9 ... Discharge due to Snowmelt, Hurricane, # Ice-Jam or Debris Dam breakup # A ... Year of occurrence is unknown or not exact # Bd ... Day of occurrence is unknown or not exact # Bm ... Month of occurrence is unknown or not exact # C ... All or part of the record affected by Urbanization, # Mining, Agricultural changes, Channelization, or other # F ... Peak supplied by another agency # O ... Opportunistic value not from systematic data collection # R ... Revised # # Gage height qualification codes(gage_ht_cd,ag_gage_ht_cd): # 1 ... Gage height affected by backwater # 2 ... Gage height not the maximum for the year # 3 ... Gage height at different site and(or) datum # 4 ... Gage height below minimum recordable elevation # 5 ... Gage height is an estimate # 6 ... Gage datum changed during this year # 7 ... Debris, mud, or hyper-concentrated flow # 8 ... Gage height tidally affected # Bd ... Day of occurrence is unknown or not exact # Bm ... Month of occurrence is unknown or not exact # F ... Peak supplied by another agency # R ... Revised # # agency_cd site_no peak_dt peak_tm peak_va peak_cd gage_ht gage_ht_cd year_last_pk ag_dt ag_tm ag_gage_ht ag_gage_ht_cd 5s 15s 10d 6s 8s 33s 8s 27s 4s 10d 6s 8s 27s USGS 01646500 1931-04-03 37900 6.90 USGS 01646500 1932-05-14 168000 15.25 USGS 01646500 1933-04-22 127000 12.80 USGS 01646500 1934-09-18 53500 7.80 USGS 01646500 1934-12-02 139000 13.50 USGS 01646500 1936-03-19 484000 28.10 3 1889 USGS 01646500 1937-04-28 347000 23.30 USGS 01646500 1937-10-30 181000 15.62 USGS 01646500 1939-02-05 129000 12.60 USGS 01646500 1940-04-22 107000 11.29 USGS 01646500 1941-04-07 73300 9.07 USGS 01646500 1942-05-24 139000 13.17 USGS 01646500 1942-10-17 447000 26.88 USGS 01646500 1944-05-09 77800 9.43 USGS 01646500 1945-09-20 138000 13.88 USGS 01646500 1946-06-04 69000 9.47 USGS 01646500 1947-03-17 43900 7.53 USGS 01646500 1948-04-16 97300 10.69 USGS 01646500 1949-06-20 135000 13.00 USGS 01646500 1950-02-03 77200 10.01 USGS 01646500 1950-12-06 140000 13.85 USGS 01646500 1952-04-29 148000 14.17 USGS 01646500 1952-11-23 140000 13.76 USGS 01646500 1954-03-03 116000 12.47 USGS 01646500 1955-08-20 216000 17.60 USGS 01646500 1956-07-21 72500 10.75 USGS 01646500 1957-04-07 78600 11.40 USGS 01646500 1958-05-07 82100 12.02 USGS 01646500 1959-06-04 61400 9.61 USGS 01646500 1960-05-10 124000 13.66 USGS 01646500 1961-02-21 116000 13.15 USGS 01646500 1962-03-23 120000 13.43 USGS 01646500 1963-03-21 128000 13.91 USGS 01646500 1964-03-06 94800 11.85 USGS 01646500 1965-03-07 111000 9.98 USGS 01646500 1966-02-15 88700 9.04 USGS 01646500 1967-03-09 147000 11.48 USGS 01646500 1968-03-18 81400 8.71 USGS 01646500 1969-03-27 30600 5.75 USGS 01646500 1970-04-03 95600 9.34 USGS 01646500 1971-02-24 91200 9.15 USGS 01646500 1972-06-24 359000 22.03 USGS 01646500 1972-10-08 90800 9.08 USGS 01646500 1973-12-28 120000 10.36 USGS 01646500 1975-09-27 195000 13.39 USGS 01646500 1976-01-03 103000 9.59 USGS 01646500 1976-10-11 208000 13.18 USGS 01646500 1978-03-16 153000 10.83 USGS 01646500 1979-02-26 206000 13.12 USGS 01646500 1979-10-12 81700 8.15 USGS 01646500 1981-04-15 55000 6.95 USGS 01646500 1982-06-15 102000 8.91 USGS 01646500 1983-04-26 128000 9.81 USGS 01646500 1984-02-16 222000 13.73 USGS 01646500 1985-02-14 106000 9.08 USGS 01646500 1985-11-07 317000 17.99 USGS 01646500 1987-04-19 167000 11.41 USGS 01646500 1988-05-20 129000 9.83 USGS 01646500 1989-05-18 107000 9.10 USGS 01646500 1990-05-31 61000 7.24 USGS 01646500 1990-10-25 102000 8.94 USGS 01646500 1992-04-24 106000 9.07 USGS 01646500 1993-03-06 189000 12.35 USGS 01646500 1994-03-30 142000 10.37 USGS 01646500 1995-01-17 101000 8.90 USGS 01646500 1996-01-21 347000 19.29 USGS 01646500 1996-12-03 105000 9.02 USGS 01646500 1998-03-22 21:15 152000 10.79 USGS 01646500 1999-03-20 10:15 46400 6.51 USGS 01646500 2000-02-21 05:15 63500 7.36 USGS 01646500 2001-03-23 16:30 75200 7.88 USGS 01646500 2002-04-24 13:30 55400 6.97 USGS 01646500 2003-09-21 07:30 167000 11.44 USGS 01646500 2003-12-12 20:15 154000 10.87 USGS 01646500 2005-03-30 17:00 140000 10.28 USGS 01646500 2006-06-29 10:15 86500 8.34 USGS 01646500 2007-04-17 12:30 116000 9.43 USGS 01646500 2008-05-13 19:00 135000 10.04 USGS 01646500 2009-05-06 08:15 124000 9.67 USGS 01646500 2010-03-15 08:15 199000 12.82 USGS 01646500 2011-04-18 16:15 173000 11.69 USGS 01646500 2011-12-09 17:15 90000 8.48 USGS 01646500 2012-10-31 15:30 141000 10.33 USGS 01646500 2014-05-17 22:00 162000 11.70 USGS 01646500 2015-04-22 13:30 62000 7.39 USGS 01646500 2016-02-05 06:45 119000 9.84 USGS 01646500 2017-05-07 12:30 81300 8.30 USGS 01646500 2018-06-05 04:30 175000 12.47 USGS 01646500 2018-12-17 13:07 156000 11.65 USGS 01646500 2020-05-02 07:30 88300 8.85 USGS 01646500 2021-03-02 19:00 97600 R 9.27 USGS 01646500 2022-05-08 23:45 118000 10.16 USGS 01646500 2022-12-24 12:15 44800 6.59