# # U.S. Geological Survey # National Water Information System # Retrieved: 2024-09-14 06:38:20 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 01638500 POTOMAC RIVER AT POINT OF ROCKS, MD # # 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 01638500 1889-06-02 460000 7 40.20 3 USGS 01638500 1895-04-10 68500 10.70 3 USGS 01638500 1896-07-26 56000 9.40 3 USGS 01638500 1896-10-01 204000 27.20 3 USGS 01638500 1898-08-12 127000 18.00 3 USGS 01638500 1899-03-06 128000 18.10 3 USGS 01638500 1900-03-21 57700 9.60 3 USGS 01638500 1901-04-22 161000 22.00 3 USGS 01638500 1902-03-02 219000 29.00 3 USGS 01638500 1903-03-01 110000 16.60 6 USGS 01638500 1904-06-01 44500 8.60 USGS 01638500 1905-03-11 71400 11.90 USGS 01638500 1906-03-29 81300 13.10 USGS 01638500 1907-03-15 119000 17.60 USGS 01638500 1908-01-13 152000 21.60 USGS 01638500 1909-04-16 83000 13.30 USGS 01638500 1910-06-18 168000 23.50 USGS 01638500 1911-09-01 106000 16.10 USGS 01638500 1912-02-28 95400 14.80 USGS 01638500 1913-03-28 139000 20.00 USGS 01638500 1914-03-19 73900 12.20 USGS 01638500 1915-06-04 139000 20.00 USGS 01638500 1916-03-29 124000 18.30 USGS 01638500 1917-03-13 123000 18.10 USGS 01638500 1918-04-16 127000 18.60 USGS 01638500 1919-05-11 80500 13.00 USGS 01638500 1920-03-06 109000 16.40 USGS 01638500 1921-05-06 88800 14.00 USGS 01638500 1922-03-17 78800 12.80 USGS 01638500 1923-04-16 40700 8.80 USGS 01638500 1924-05-13 277000 32.20 USGS 01638500 1925-02-13 89000 15.00 USGS 01638500 1926-02-27 60500 11.50 USGS 01638500 1926-11-17 89900 15.10 USGS 01638500 1928-05-02 145000 21.30 USGS 01638500 1929-04-18 180000 24.94 USGS 01638500 1929-10-23 110000 17.40 USGS 01638500 1931-05-24 36800 8.16 USGS 01638500 1932-05-14 158000 23.34 USGS 01638500 1933-04-21 123000 19.30 USGS 01638500 1934-01-09 36700 8.06 USGS 01638500 1934-12-02 128000 19.78 USGS 01638500 1936-03-19 480000 41.03 USGS 01638500 1937-04-27 310000 33.86 USGS 01638500 1937-10-30 175000 24.93 USGS 01638500 1939-02-05 124000 19.39 USGS 01638500 1940-04-21 93600 15.67 USGS 01638500 1941-04-07 69000 12.56 USGS 01638500 1942-05-24 125000 21.13 USGS 01638500 1942-10-16 418000 40.43 USGS 01638500 1944-05-08 70300 13.92 USGS 01638500 1945-09-20 139000 21.98 USGS 01638500 1946-06-03 53100 11.40 USGS 01638500 1947-03-16 42100 9.65 USGS 01638500 1948-04-15 87000 16.04 USGS 01638500 1949-06-20 132000 21.20 USGS 01638500 1950-02-03 64700 13.09 USGS 01638500 1950-12-05 128000 20.75 USGS 01638500 1952-04-29 127000 20.67 USGS 01638500 1952-11-23 118000 19.68 USGS 01638500 1954-03-03 109000 18.65 USGS 01638500 1955-08-20 214000 29.08 USGS 01638500 1956-04-09 60800 12.54 USGS 01638500 1957-04-07 69200 13.74 USGS 01638500 1958-05-07 72000 14.13 USGS 01638500 1959-06-04 55700 11.80 USGS 01638500 1960-05-10 124000 20.28 USGS 01638500 1961-02-21 102000 17.90 USGS 01638500 1962-03-23 116000 19.45 USGS 01638500 1963-03-21 125000 20.47 USGS 01638500 1964-03-06 87000 16.00 USGS 01638500 1965-03-06 97800 17.35 USGS 01638500 1966-02-15 71300 14.04 USGS 01638500 1967-03-08 144000 22.53 USGS 01638500 1968-03-18 76800 14.73 USGS 01638500 1969-03-27 27800 7.15 USGS 01638500 1970-04-03 92100 16.64 USGS 01638500 1971-02-24 86400 15.92 USGS 01638500 1972-06-23 347000 37.43 USGS 01638500 1972-10-08 106000 18.28 USGS 01638500 1973-12-28 132000 21.27 USGS 01638500 1975-03-21 181000 26.15 USGS 01638500 1976-01-02 109000 18.71 USGS 01638500 1976-10-11 193000 27.25 USGS 01638500 1978-03-16 139000 22.01 USGS 01638500 1979-02-27 178000 25.94 USGS 01638500 1979-10-11 69500 13.87 USGS 01638500 1981-04-14 41900 9.81 USGS 01638500 1982-06-15 92000 16.66 USGS 01638500 1983-04-26 115000 19.21 USGS 01638500 1984-02-16 199000 28.14 USGS 01638500 1985-02-13 84700 15.57 USGS 01638500 1985-11-07 309000 36.28 USGS 01638500 1987-04-18 153000 23.49 USGS 01638500 1988-05-20 96100 17.01 USGS 01638500 1989-05-17 80900 15.11 USGS 01638500 1990-05-31 39800 9.30 USGS 01638500 1991-03-25 85000 15.63 USGS 01638500 1992-04-23 90000 16.25 USGS 01638500 1993-03-06 167000 24.94 USGS 01638500 1993-11-29 115000 19.25 USGS 01638500 1995-01-17 87200 15.90 USGS 01638500 1996-01-21 310000 36.34 USGS 01638500 1996-12-03 85200 15.65 USGS 01638500 1998-03-22 16:00 123000 20.24 USGS 01638500 1999-03-20 01:30 40600 9.42 USGS 01638500 2000-02-20 19:30 61600 12.54 USGS 01638500 2001-03-23 06:00 66600 13.23 USGS 01638500 2002-04-24 03:45 52300 11.21 USGS 01638500 2003-09-21 01:30 150000 23.12 USGS 01638500 2003-12-12 15:15 118000 19.58 USGS 01638500 2005-03-30 09:45 116000 19.37 USGS 01638500 2005-12-01 11:00 73100 14.10 USGS 01638500 2007-04-17 05:15 96000 17.00 USGS 01638500 2008-05-13 14:30 96000 16.99 USGS 01638500 2009-05-06 02:45 100000 17.50 USGS 01638500 2010-03-15 03:15 172000 25.52 USGS 01638500 2011-04-18 10:30 144000 22.52 USGS 01638500 2011-12-09 11:00 74800 14.32 USGS 01638500 2012-10-31 09:00 106000 18.19 USGS 01638500 2014-05-17 16:45 145000 22.62 USGS 01638500 2015-04-22 03:45 52300 11.21 USGS 01638500 2016-02-05 00:15 88000 16.00 USGS 01638500 2017-05-07 02:15 71300 13.86 USGS 01638500 2018-06-04 20:30 175000 25.83 USGS 01638500 2018-12-17 07:45 143000 22.40 USGS 01638500 2020-05-02 02:15 78300 14.77 USGS 01638500 2021-03-02 11:30 91100 16.39 USGS 01638500 2022-05-08 20:30 107000 18.29 USGS 01638500 2023-03-05 10:45 34700 8.40