# # U.S. Geological Survey # National Water Information System # Retrieved: 2024-05-10 11:01:05 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 01100500 MERRIMACK RIVER AT LAWRENCE, MA # # 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 01100500 1852-04-23 108000 6,7 44.12 USGS 01100500 1880-04-06 29200 6 USGS 01100500 1881-03-12 31400 6 USGS 01100500 1882-03-04 38800 6 USGS 01100500 1883-04-15 36400 6 USGS 01100500 1884-03-29 60200 6 USGS 01100500 1885-04-24 25600 6 USGS 01100500 1886-02-15 59400 6 USGS 01100500 1887-04-13 51200 6 USGS 01100500 1888-05-01 48700 6 USGS 01100500 1888-12-19 43700 6 USGS 01100500 1890-03-24 38300 6 USGS 01100500 1891-03-25 52100 6 USGS 01100500 1892-05-24 32100 6 USGS 01100500 1893-05-06 57700 6 USGS 01100500 1894-03-09 29200 6 USGS 01100500 1895-04-16 89900 6 USGS 01100500 1896-03-03 105000 6 USGS 01100500 1897-07-16 52800 6 USGS 01100500 1898-03-15 44400 6 USGS 01100500 1899-04-17 47800 6 USGS 01100500 1900-02-15 63500 6 USGS 01100500 1901-04-09 84500 6 USGS 01100500 1902-03-04 73100 6 USGS 01100500 1903-03-13 53600 6 USGS 01100500 1904-05-01 60600 6 USGS 01100500 1905-03-30 51800 6 USGS 01100500 1906-05-30 48700 6 USGS 01100500 1907-04-01 31300 6 USGS 01100500 1907-11-08 42000 6 USGS 01100500 1909-04-17 46500 6 USGS 01100500 1910-03-03 34500 6 USGS 01100500 1911-03-31 25200 6 USGS 01100500 1912-04-09 35400 6 USGS 01100500 1913-03-29 49100 6 USGS 01100500 1914-04-22 42700 6 USGS 01100500 1915-02-27 49100 6 USGS 01100500 1916-05-19 42800 6 USGS 01100500 1917-03-29 38500 6 USGS 01100500 1918-04-04 30800 6 USGS 01100500 1919-03-30 48700 6 USGS 01100500 1920-03-29 59500 6 USGS 01100500 1920-12-16 47900 6 USGS 01100500 1922-04-13 47400 6 USGS 01100500 1923-05-01 66200 6 USGS 01100500 1924-04-09 55200 6 USGS 01100500 1925-03-31 58500 6 USGS 01100500 1926-04-27 38800 6 USGS 01100500 1927-03-17 34800 6 USGS 01100500 1927-11-06 78900 6 USGS 01100500 1929-05-05 36800 6 USGS 01100500 1930-04-09 28700 6 USGS 01100500 1931-06-11 35600 6 USGS 01100500 1932-04-14 50900 6 USGS 01100500 1933-04-20 76200 6 USGS 01100500 1934-04-14 60800 6 USGS 01100500 1935-01-11 46500 6 USGS 01100500 1936-03-20 174000 6 48.00 USGS 01100500 1937-05-17 40500 6 USGS 01100500 1938-09-23 116000 6 USGS 01100500 1939-04-21 48400 6 USGS 01100500 1940-04-14 56800 6 USGS 01100500 1941-02-10 19300 6 USGS 01100500 1942-03-11 28300 6 USGS 01100500 1943-05-14 28200 6 USGS 01100500 1944-06-26 49100 6 USGS 01100500 1945-03-23 40800 6 USGS 01100500 1945-12-09 37800 6 USGS 01100500 1947-04-14 31200 6 USGS 01100500 1948-03-24 54200 6 USGS 01100500 1949-01-08 25500 6 USGS 01100500 1950-04-23 35200 6 USGS 01100500 1951-04-05 55400 6