U.S. GEOLOGICAL SURVEY
WATER-RESOURCES CONDITIONS IN NEW YORK
APRIL 2007
U.S. GEOLOGICAL SURVEY, WRD
New York District, Troy, NY
WATER RESOURCES REVIEW AND CURRENT CONDITIONS STATEMENT
FOR APRIL 2007
Prepared May 1, 2007
Troy--Summary Report
Provisional streamflow conditions at all sites monitored and included in this report in
eastern New York were in the normal to excessive range. A storm event, which occurred April
15-16, caused flooding across the eastern Catskills and Hudson Valley regions. New peaks of
record were recorded at many of the Croton Reservoir System outflow gages that have
relatively short periods of record (less than 15 years). The highest provisional period-
of-record maximum monthly mean discharge for April was recorded at one site included in
this report: Wappinger Creek near Wappingers Falls (79 years).
The total New York City reservoir system was at 100.4 percent of capacity on April 27;
normal for this period is 99.4 percent of capacity.
Ithaca--Summary Report
Provisional streamflow conditions at sites monitored and included in this report
for western New York were in the deficient to excessive range during April. Streamflow
at Susquehanna River at Conklin and Oneida Creek at Oneida was in the excessive range
for the second consecutive month. Streamflow at Unadilla River at Rockdale, Chenango
River near Chenango Forks, Chemung River at Chemung, Allegheny River at Salamanca,
Cattaraugus Creek at Gowanda, Tonawanda Creek at Batavia, Oatka Creek at Garbutt, Fall
Creek near Ithaca, and Flint Creek at Phelps was in the normal range after being in the
excessive range last month. Streamflow at Genesee River at Wellsville was in the deficient
range after being in the excessive range last month.
Coram--Summary Report
Provisional streamflow at Connetquot Brook near Central Islip was in the excessive range
for the seventh consecutive month.
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Provisional Data for April 2007
MEAN FLOW FOR SELECTED GAGING STATIONS
Period
of record Flow Percent
Station (to date) (cfs) Exceedence Conditions
01306460 Connetquot Brook nr Central Islip 1978 47.5 7 Excessive
01312000 Hudson River at Newcomb 1925-87,2002 1,440 20 Excessive
01318500 Hudson River at Hadley 1921 10,500 21 Excessive
01321000 Sacandaga River nr Hope 1911 4,160 29 Normal
01334500 Hoosic River near Eagle Bridge 1910 2,950 24 Excessive
01349150 Canajoharie Creek near Canajoharie 1993 337 24 Excessive
01350000 Schoharie Creek at Prattsville 1902 2,050 7 Excessive
01357500 Mohawk River at Cohoes 1917 23,800 6 Excessive
01371500 Wallkill River at Gardiner 1924 4,010 3 Excessive
01372500 Wappinger Cr nr Wappingers Falls 1928 1,200 0 Excessive
01387400 Ramapo River at Ramapo 1979 662 8 Excessive
01413500 E Br Delaware River at Margaretville 1937 1,080 14 Excessive
01420500 Beaver Kill at Cooks Falls 1913 1,590 28 Normal
01423000 W Br Delaware River at Walton 1950 1,740 19 Excessive
01426000 Oquaga Creek at Deposit **1941-73,2002 357 12 Excessive
01502500 Unadilla River at Rockdale 1930-95,2001 2,430 28 Normal
01503000 Susquehanna River at Conklin 1912 11,100 20 Excessive
01512500 Chenango River nr Chenango Forks 1912 5,980 35 Normal
01531000 Chemung River at Chemung 1903 4,850 61 Normal
03011020 Allegheny River at Salamanca 1903 4,130 75 Normal
04213500 Cattaraugus Creek at Gowanda 1940-98,2000 1,370 59 Normal
04217000 Tonawanda Creek at Batavia 1944 484 47 Normal
04221000* Genesee River at Wellsville 1916 563 77 Deficient
04230500 Oatka Creek at Garbutt 1945 447 54 Normal
04234000 Fall Creek at Ithaca 1925 402 44 Normal
04235250 Flint Creek at Phelps 1960-95,2002 269 34 Normal
04243500 Oneida Creek at Oneida 1950 505 13 Excessive
04250750 Sandy Creek near Adams 1958-95,2002 677 40 Normal
04256000 Independence River at Donnattsburg 1942 504 44 Normal
04262500 W Br Oswegatchie R nr Harrisville 1916 1,390 45 Normal
04270200 Little Salmon River at Bombay 1958-95,2002 277 53 Normal
04275500 Ausable River at Au Sable Forks 1910-68,1990 2,380 21 Excessive
** Statistics used based on record for 1941-1973 water years
* Includes 04221500-Genesee River at Scio (1916-72)
MONTHLY MEAN DISCHARGE FOR SELECTED STREAMFLOW STATIONS
Provisional Data for April 2007
INDEX OBSERVATION WELLS
The observation-well network generally reflects conditions in water-table sand and gravel aquifers and does not necessarily reflect conditions in confined and bedrock aquifers. Water levels in S1810 have been affected by changes in ground-water
withdrawals or sewering. Water level in feet below land-surface datum unless site noted with * which indicates reference to
sea level or ** which indicates water level in feet above land-surface datum. Statistics used for A-654(replacement) are from A-636 (adjusted) prior to 2003, for Cm-622 (replacement) are from Cm-46(adjusted) prior to 2003, and for U-1619(replacement) are from U-405(adjusted) prior to 2003. All published data for A-654 prior to 2006 water year should be adjusted by +1.00 ft due to measuring point correction.
Record Percent
County Well No. begins Date Water Level Exceedence Conditions
Albany A-654 2002 04/11 6.33 0 Excessive
Allegany Ag-261 2002 04/30 4.43 - --
Allegany Ag-262 2002 04/25 -0.82 - --
Broome Bm-128 1980 04/30 22.19 54 Normal
Broome Bm-129 1985 04/30 66.83 32 Normal
Cattaraugus Ct-121 1951 04/30 4.72 50 Normal
Cayuga Cy-223 2005 -- -- - --
Chautauqua Cu-10 1939 04/25 15.57 28 Normal
Chemung Cm-622 2002 04/30 22.60 36 Normal
Chenango Cn-12 1975 04/30 6.55 19 Excessive
Clinton Cl-145 1992 04/30 22.46 63 Normal
Clinton Cl-242 2006 04/17 0.48 - --
Columbia Cb-1071 2004 04/20 8.82 - --
Columbia Cb-1072 2006 04/20 6.52 - --
Cortland C-998 2002 04/30 4.25 - --
Delaware D-503 2002 04/30 3.62 - --
Dutchess Du-321 1948 04/30 66.60 10 Excessive
Dutchess Du-1009 1967 04/30 12.82 35 Normal
Erie E-1196 2004 04/30 10.97 - --
Essex Ex-150 2002 04/30 14.41 - --
Essex Ex-157 2006 04/23 16.99 - --
Franklin F-60 2005 04/30 2.81 - --
Franklin F-854 2005 04/30 29.19 - --
Fulton Fu-271 2002 04/30 12.84 - --
Genesee Gs-190 2002 04/30 19.41 - --
Greene G-644 2003 04/24 14.45 - --
Greene G-831 2006 04/19 1.10 - --
Hamilton H-3 1966 04/30 9.65 5 Excessive
Herkimer He-627 2004 04/24 26.52 - --
Jefferson J-176 2005 04/05 1.34 - --
Lewis L-174 2002 04/30 21.30 - --
Livingston Lv-330 2004 04/24 6.84 - --
Madison M-178 1975 04/30 5.84 36 Normal
Monroe Mo-11 1984 -- -- - --
Montgomery Mt-411 2004 -- -- - --
Niagara Ni-70 1973 04/30 2.54 66 Normal
Niagara Ni-869 2003 04/30 0.19 - --
Oneida Oe-151 1926 04/30 15.85 30 Normal
Oneida Oe-1457 2003 04/30 40.77 - --
Onondaga Od-1825 2004 -- -- - --
Onondaga Od-1833 2004 -- -- - --
Ontario **Ot-900 1955 04/26 9.27 50 Normal
Ontario Ot-1133 2002 04/30 2.49 - --
Orange O-2271 2002 04/30 5.80 - --
Orange O-2288 2007 -- -- - --
Orleans Ol-20 2004 04/30 15.24 - --
Oswego Ow-5013 2002 04/30 21.34 - --
Oswego Ow-5014 2002 04/30 21.90 - --
Otsego Og-23 1953 04/30 5.30 60 Normal
Putnam P-1217 2005 04/30 12.45 - --
Rensselaer Re-703 1983 04/30 35.17 11 Excessive
Rockland Ro-18 1949 04/30 14.48 38 Normal
Rockland Ro-543 2005 04/30 5.38 - --
St. Lawrence St-40 1953 04/30 4.62 24 Excessive
St. Lawrence St-404 1958 04/30 13.35 84 Deficient
Saratoga Sa-529 1949 04/30 39.11 0 Excessive
Saratoga Sa-1285 2002 04/30 0.34 - --
Schenectady Sn-730 2004 04/11 2.80 - --
Schoharie So-602 2005 04/25 21.41 - --
Schoharie So-604 2006 04/25 9.14 - --
Schuyler Sy-706 2003 04/24 4.62 - --
Seneca Se-532 2005 04/30 0.18 - --
Seneca Se-533 2005 04/30 -0.58 - --
Steuben Sb-472 1965 04/30 6.95 62 Normal
Suffolk *S1810 1976 04/30 53.25 22 Excessive
Suffolk *S1812 1982 05/01 51.67 0 Excessive
Suffolk *S4271 1946 04/30 13.21 0 Excessive
Suffolk *S5517 1948 04/30 45.53 1 Excessive
Suffolk *S8833 1951 04/30 19.31 0 Excessive
Sullivan Sv-535 2001 04/30 6.52 12 Excessive
Tioga Ti-891 2003 04/30 16.34 - --
Tompkins Tm-985 2005 -- -- - --
Tompkins Tm-1968 2005 -- -- - --
Ulster U-1619 2002 04/30 14.52 3 Excessive
Ulster U-1620 2005 -- -- - --
Warren Wr-80 2005 -- -- - --
Washington W-533 1974 04/30 5.36 31 Normal
Wayne Wn-592 2004 04/27 8.06 - --
Westchester We-5020 2003 04/30 6.53 - --
Wyoming Wo-4 1974 04/30 11.11 44 Normal
Yates Ya-180 2004 04/24 2.98 - --
INDEX OBSERVATION WELLS
LAKES AND RESERVOIRS
Elevation & Storage at End of Month
Reservoirs (Storage in million cubic feet) Current Year Last Year Average
01314500 Indian Lake nr Indian Lake, NY 4,600 4,676 4,170
01323500 Great Sacandaga Lake at Conklinville 38,620 36,410 31,760
04295000 Richelieu River (Lake Champlain) at Rouses Point, NY - Elevation in ft
above sea level
April 30, 2007 100.46 April 30, 2006 97.13
Average (1939-2005) 98.30
Maximum daily 101.81 (1993) Minimum daily 94.11 (1965)
NOTES, DEFINITIONS, ETC.
Percent exceedence is, for example, the percentage of December monthly mean discharges for
period of record equal to or greater than the current December monthly mean discharge.
Median = 50th percentile, which means that, for the period of record included in the analysis,
50% of the values are greater than the median and 50% are less.
Deficient range = values below the 25th percentile - for the period of record included in the
analysis, 75% of the values are greater and 25% are less than this value.
Excessive range = values above the 75th percentile - for the period of record included in the
analysis, 25% of the values are greater and 75% are less than this value.
Normal range = values between the 25th and 75th percentiles.
