# # U.S. Geological Survey # National Water Information System # Retrieved: 2024-04-27 12:09:52 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 01661500 ST MARYS RIVER AT GREAT MILLS, 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 01661500 1947-04-16 420 5.73 USGS 01661500 1948-08-04 1560 9.32 USGS 01661500 1949-07-16 2020 9.91 USGS 01661500 1949-10-31 659 7.67 USGS 01661500 1951-08-08 520 6.63 USGS 01661500 1952-01-29 620 7.44 USGS 01661500 1953-08-14 656 7.68 USGS 01661500 1954-01-27 296 4.55 USGS 01661500 1955-08-13 4350 11.77 USGS 01661500 1956-06-02 263 4.22 USGS 01661500 1956-11-02 2780 10.66 USGS 01661500 1958-08-25 3030 10.87 USGS 01661500 1959-07-15 580 7.09 USGS 01661500 1960-07-30 4900 12.08 USGS 01661500 1961-01-01 712 7.66 USGS 01661500 1962-01-07 798 7.96 USGS 01661500 1963-06-03 1440 9.15 USGS 01661500 1964-02-16 473 6.18 USGS 01661500 1965-03-05 341 4.98 USGS 01661500 1966-09-21 413 5.64 USGS 01661500 1966-10-19 870 8.15 USGS 01661500 1968-01-14 696 6.78 USGS 01661500 1969-08-20 7950 13.34 USGS 01661500 1969-12-26 457 5.26 USGS 01661500 1971-05-30 1280 8.79 USGS 01661500 1972-06-22 1890 9.75 USGS 01661500 1973-02-02 828 7.35 USGS 01661500 1974-03-31 559 5.98 USGS 01661500 1975-03-19 804 7.02 USGS 01661500 1976-01-28 676 6.32 USGS 01661500 1977-06-18 265 3.50 USGS 01661500 1978-01-18 934 7.62 USGS 01661500 1979-02-25 3160 10.97 USGS 01661500 1980-07-23 408 4.58 USGS 01661500 1981-05-11 252 3.39 USGS 01661500 1982-06-05 491 5.15 USGS 01661500 1983-04-16 1230 8.63 USGS 01661500 1984-05-30 1820 9.66 USGS 01661500 1985-09-27 3110 10.93 USGS 01661500 1985-11-30 597 5.85 USGS 01661500 1986-12-25 877 7.36 USGS 01661500 1988-02-12 598 5.86 USGS 01661500 1989-07-16 968 7.76 USGS 01661500 1990-05-29 2360 10.28 USGS 01661500 1991-01-12 664 6.15 USGS 01661500 1992-09-06 2050 9.95 USGS 01661500 1993-03-13 1100 8.25 USGS 01661500 1994-03-03 3470 11.21 USGS 01661500 1995-03-09 459 4.66 USGS 01661500 1996-07-13 1230 8.61 USGS 01661500 1996-10-19 803 6.96 USGS 01661500 1998-02-05 01:30 3560 11.27 USGS 01661500 1999-09-16 14:30 6560 12.82 USGS 01661500 2000-07-26 16:00 1240 8.64 USGS 01661500 2001-08-13 09:30 607 5.78 USGS 01661500 2002-04-28 15:00 242 3.29 USGS 01661500 2003-05-26 12:30 803 6.96 USGS 01661500 2004-07-28 00:15 1610 9.37 USGS 01661500 2005-04-02 21:15 689 6.31 USGS 01661500 2007-03-17 03:00 1020 7.98 USGS 01661500 2008-06-05 07:00 1710 9.51 USGS 01661500 2009-05-08 03:00 481 4.81 USGS 01661500 2010-09-30 13:30 2920 10.78 2 USGS 01661500 2011-08-28 6960 12.98 USGS 01661500 2012-09-02 20:15 587 5.65 USGS 01661500 2012-10-30 02:30 1350 8.96 USGS 01661500 2013-12-09 08:30 400 4.31 USGS 01661500 2015-06-28 797 6.93 USGS 01661500 2016-02-25 04:15 805 6.97 USGS 01661500 2017-07-06 17:15 768 6.77 USGS 01661500 2018-05-18 18:30 1130 8.34 USGS 01661500 2019-07-08 19:15 902 7.45 USGS 01661500 2020-08-04 11:30 3900 11.57 USGS 01661500 2020-11-12 02:45 3830 11.46 USGS 01661500 2022-07-25 22:30 809 6.99