Home Archived February 7, 2019
Site Information
01387500   Ramapo River near Mahwah, NJ
Location:Latitude 41�'53", Longitude 74�'46", Bergen County, Hydrologic Unit 02030103, on left bank 350 ft downstream from State Highway 17, 0.6 mi downstream from Mahwah River, 1.0 mi west of Mahwah, and 1.2 mi downstream of New York-New Jersey state-line.
Drainage Area:Continuous Period of Record:RemarksSite Type:Baseline Period of Record:Baseline Quality
1201903-1906,1923-2005Flow effected by pumping from groundwater wells in Oakland, Mahwah, NJ and Hillburn and Suffern NY for municipal supply.A1923-1964EXCELLENT

Hydrologic Indices
Flow RegimeFlow EventIndex NameIndex Value
Index Type
Average FlowSurrogate for25th Percentile*Value75th Percentile*
Temporal MA158217.23267
Temporal MA258132267
Temporal MA388.18110.73150.25
Spatial MA415.5520.3123.27
Spatial MA51.51.651.81
Spatial MA69.2716.6222
Spatial MA74.136.858.25
Spatial MA83.014.65.36
Spatial MA90.450.580.67
Spatial MA100.290.390.44
Spatial MA110.240.310.35
Temporal MA12150.22206.95358.25
Temporal MA13183.77251.4321.85
Temporal MA14286.27418.18543.43
Temporal MA15243.99380532.43
Temporal MA16130.73194.84329.63
Temporal MA1772.8296.85157.87
Temporalac MA1834.8258.27105.52
Temporal MA1926.1146.21133.98
Temporal MA2032.3863.92160.21
Temporal MA2143.2179.65136.11
Temporal MA2265.94163.43342.09
Temporal MA23123.32219.69364.4
Temporal MA2443.9660.376.28
Temporal MA2533.1348.7274.34
Temporalb MA26MA1832.2149.6670.67
Temporal MA2740.152.0167.12
Temporal MA2839.247.1557.35
Temporal MA2936.7146.7868.32
Temporal MA3036.9456.5982.79
Temporal MA3132.8547.986.69
Temporal MA3228.9759.59105.82
Temporal MA3330.542.92108.04
Temporal MA3437.2258.4694.64
Temporal MA3542.3361.4285.09
Spatial MA364.226.446.16
Spatialb MA37MA181.031.431.56
Spatial MA381.912.422.67
Spatialb MA39MA1865.8580.7983.59
Spatial MA400.160.230.33
Temporal MA411.391.812.18
Spatial MA420.981.141.38
Spatial MA430.350.470.46
Spatial MA440.640.730.81
Spatial MA4500.070.04
Low Flow
Temporalc ML175.7590132
Temporalc ML279.5113150.5
Temporalc ML3123159.5207.25
Temporalc ML4124146231
Temporalc ML563.2599137
Temporalac ML630.7548.562.25
Temporalc ML7202739
Temporalc ML813.7520.534.25
Temporalc ML9142441.25
Temporalc ML10193049.25
Temporalc ML1125.555110.5
Temporalc ML1249.7576.5137.75
Temporalb ML13ML660.1779.0482.11
Temporal ML140.110.140.21
Temporal ML150.060.090.11
Temporalb ML16ML60.110.140.21
Temporal ML170.070.090.12
Spatial ML1839.9141.4268.72
Temporal ML196.298.610.62
Spatial ML200.440.510.55
Spatial ML2142.5554.5769.33
Temporal ML220.10.150.21
High Flow
Temporal MH1385.756031230
Temporal MH2384541954
Temporal MH365010651475
Temporal MH4581.25911.51545
Temporalac MH5295.75463814
Temporal MH6160.75260447.25
Temporal MH777.25174.5461.75
Temporal MH848.5119.5471.75
Temporal MH978133.5567.5
Temporal MH1078177637.75
Temporal MH111585541140
Temporal MH12252.756781297.5
Spatial MH1393.81118.69114.16
Temporal MH1412.2215.1323.95
Spatial MH158.7610.0813.21
Spatialb MH16MH53.083.654.07
Spatial MH171.762.022.22
Spatialb MH18MH54.947.196.87
Spatial MH19-
Temporalb MH20MH510.8315.8826.81
Temporal MH2131.2733.1434.18
Temporal MH228.512.4714.11
Temporal MH232.368.888.96
Temporal MH241.264.815.48
Temporal MH253.777.328.5
Temporal MH268.1112.3513.11
Temporal MH272.586.037.09
Index Type
Low FlowSurrogate for
Spatialbc FL1FL35711
Spatial FL241.0357.4849.22
Temporala FL3000
High Flow
Temporalb FH1FH4812.515.25
Spatial FH225.9335.5335.5
Temporalbc FH3FH437.254667.25
Temporala FH43815.25
Temporal FH579.512.25
Temporal FH671014
Temporal FH723.57
Temporal FH8812.515.25
Temporalb FH9FH45810.25
Temporal FH1011.55.25
Temporal FH11001
Index Type
Low FlowSurrogate for
Temporal DL11217.525.25
Temporal DL21418.6728.08
Temporal DL315.6119.5731.93
Temporalac DL419.3925.5242
Temporal DL529.8548.4581.18
Spatialb DL6DL442.5554.5769.33
Spatial DL741.8152.1767.21
Spatial DL840.0356.0362.6
Spatial DL946.6774.4174.66
Spatial DL1045.7775.2272.12
Temporal DL110.090.150.19
Temporalb DL12DL40.120.180.24
Temporal DL130.150.260.32
Temporal DL140.420.440.58
Temporal DL150.210.220.34
Temporalb DL16DL46.6411.4317.38
Spatial DL1748.957.2168.18
Temporal DL18000
Spatial DL19NC0NC
Spatial DL20NC0NC
High Flow
Temporal DH1130019053217.5
Temporalac DH21032.251471.672148.33
Temporal DH3788.821068.571464.71
Temporal DH4498.97573.55728.79
Temporal DH5328.19411.75476.3
Spatial DH641.8763.3957.44
Spatial DH739.6652.5449.95
Spatialb DH8DH233.2842.441.55
Spatial DH926.1530.7433.42
Spatial DH1025.3725.0429.39
Temporal DH119.8519.2724.38
Temporal DH125.989.0511.1
Spatialb DH13DH23.784.795.52
Spatial DH140.10.120.21
Temporal DH156.317.359.46
Spatial DH1630.5637.3446.84
Temporal DH1713.7118.8822.17
Temporal DH183.814.555.64
Temporal DH191.722.43
Temporalb DH20DH26.317.359.46
Temporal DH2122.637.1447.25
Temporal DH2234155.5226.63
Temporal DH23113
Temporal DH2473.25163300.25
Index Type
Average FlowSurrogate for
Spatial TA10.430.490.55
Spatial TA257.7460.8464.06
Spatial TA30.250.320.36
Low Flow
Spatiala TL1246.84248.58262.49
Spatial TL232.1731.5141.58
Spatial TL30.460.520.6
Spatial TL40.020.030.04
High Flow
Spatiala TH142.842.0470.44
Spatial TH264.5165.2271.59
Spatial TH30.120.150.38
Rate of Change
Index Type
Average FlowSurrogate for
Temporal RA151772
Spatial RA2211.25273.85271.7
Temporalac RA3-39-15-5
Spatial RA4-289.34-285.26-225.38
Spatialb RA5RA30.280.310.31
Temporal RA60.070.170.41
Temporalb RA7RA3-0.2-0.12-0.07
Temporalb RA8RA3105.75119.5132.25
Spatial RA97.9114.3711.49

a primary index as determined from the New Jersey Hydrologic Integrity Assessment Process (Henriksen and others, 2006; Kennen and others, 2007)
b surrogate index as determined from the New Jersey Hydrologic Integrity Assessment Process (Henriksen and others, 2006; Kennen and others, 2007)
c primary regulatory index for the New Jersey Department of Environmental Protection (J.L. Hoffman, NJDEP, written commun., 2007).

# indicates that site is an index station

* If the index is spatial, percentile values are from the distribution of values for the selected index for all sites of the same stream type if the index is spatial

** These sites are index sites, which are considered to be relatively undeveloped (least amount of urbanization, less than 15% urban landuse) for a long period of record (at least 50 years). The entire period of record for these sites are considered baseline.

NC value could not be calculated