Home Archived February 7, 2019
Site Information
01402000   Millstone River at Blackwells Mills, NJ
Location:Latitude 40�'30", Longitude 74�'33", Somerset County, Hydrologic Unit 02030105, on left bank 30 ft downstream from highway bridge at Blackwells Mills, and 0.3 mi downstream from Six Mile Run .
Drainage Area:Continuous Period of Record:RemarksSite Type:Baseline Period of Record:Baseline Quality
2581921-2005Inflow from and losses to Delaware and Raritan Canal above station. Flow slightly regulated by Carnegie Lake (capacity, 310,000,000 gal) and several smaller reservoirs (combined capacity, 49,800,000 gal)A1921-1960EXCELLENT

Hydrologic Indices
Flow RegimeFlow EventIndex NameIndex Value
Index Type
Average FlowSurrogate for25th Percentile*Value75th Percentile*
Temporal MA1105367.68390
Temporal MA2105200390
Temporal MA3108.45139.62166.25
Spatial MA415.5516.5423.27
Spatial MA51.51.841.81
Spatial MA69.2712.722
Spatial MA74.135.118.25
Spatial MA83.013.715.36
Spatial MA90.450.480.67
Spatial MA100.290.310.44
Spatial MA110.240.250.35
Temporal MA12244.19440.61615.32
Temporal MA13383.87554.04768.1
Temporal MA14479.73628.5873.82
Temporal MA15307.12462.77736.59
Temporal MA16188.75277.1403.79
Temporal MA17115.58164.98254.94
Temporalac MA1885.73116.34313.96
Temporal MA1971.52138.26288.12
Temporal MA2080.43123.22330.32
Temporal MA2182.19142.65204.82
Temporal MA22122.53303.78493.83
Temporal MA23217.79382549.77
Temporal MA2456.9579.31100.71
Temporal MA2564.790.58101.92
Temporalb MA26MA1860.0477.6689.82
Temporal MA2756.0178.1993.31
Temporal MA2841.0854.3581.9
Temporal MA2935.6660.4185.12
Temporal MA3038.6465.23124.77
Temporal MA3137.2471.56107.58
Temporal MA3237.670.21123.68
Temporal MA3329.2450.62106.9
Temporal MA3433.5460.85107.21
Temporal MA3559.790.47105.55
Spatial MA364.224.56.16
Spatialb MA37MA181.031.291.56
Spatial MA381.912.342.67
Spatialb MA39MA1865.8575.383.59
Spatial MA400.160.220.33
Temporal MA411.161.431.7
Spatial MA420.980.991.38
Spatial MA430.350.380.46
Spatial MA440.640.720.81
Spatial MA4500.020.04
Low Flow
Temporalc ML193.5149182
Temporalc ML2105.75152.5236.75
Temporalc ML3192.25220285.5
Temporalc ML4156180.5235
Temporalc ML5101122183.25
Temporalac ML64682102.5
Temporalc ML734.552.569.75
Temporalc ML83146.578.25
Temporalc ML926.755687.5
Temporalc ML1046.56786.75
Temporalc ML1170.75111.5161
Temporalc ML1287119156
Temporalb ML13ML660.1767.8182.11
Temporal ML140.090.160.23
Temporal ML150.050.080.13
Temporalb ML16ML60.090.160.23
Temporal ML170.060.10.14
Spatial ML1839.9154.2768.72
Temporal ML195.248.3112.99
Spatial ML200.440.410.55
Spatial ML2142.5563.469.33
Temporal ML220.070.130.18
High Flow
Temporal MH1943.7515152697.5
Temporal MH2149521253042.5
Temporal MH3157026053430
Temporal MH4915.517852870
Temporalac MH5418.5879.51582.5
Temporal MH6216.25530894
Temporal MH7180.55111750
Temporal MH8125.55461425
Temporal MH9164.25369.51655
Temporal MH10145.75349.5742.25
Temporal MH11242.758752342.5
Temporal MH1271114952422.5
Spatial MH1393.81102.83114.16
Temporal MH1416.4619.9633.73
Spatial MH158.7613.6313.21
Spatialb MH16MH53.0844.07
Spatial MH171.761.952.22
Spatialb MH18MH54.945.016.87
Spatial MH19-0.070.370.41
Temporalb MH20MH512.1916.822.95
Temporal MH2126.8330.5532.58
Temporal MH2211.4113.3116.73
Temporal MH236.5910.2911.03
Temporal MH241.436.178.05
Temporal MH254.198.6611.2
Temporal MH268.6513.215
Temporal MH272.827.39.65
Index Type
Low FlowSurrogate for
Spatialbc FL1FL37.251011
Spatial FL241.0339.1649.22
Temporala FL3001
High Flow
Temporalb FH1FH412.251518.75
Spatial FH225.9330.5135.5
Temporalbc FH3FH43648.567.75
Temporala FH4101421
Temporal FH5101315.75
Temporal FH6111416
Temporal FH757.510
Temporal FH812.251518.75
Temporalb FH9FH471011
Temporal FH10112
Temporal FH11001
Index Type
Low FlowSurrogate for
Temporal DL117.2532.547.5
Temporal DL218.6735.551
Temporal DL323.9338.3658.61
Temporalac DL444.2863.7890.83
Temporal DL577.92129.08198.18
Spatialb DL6DL442.5563.469.33
Spatial DL741.8161.7267.21
Spatial DL840.0363.5162.6
Spatial DL946.6759.0774.66
Spatial DL1045.7758.2672.12
Temporal DL110.090.170.24
Temporalb DL12DL40.120.230.29
Temporal DL130.220.360.45
Temporal DL140.420.530.58
Temporal DL150.210.320.34
Temporalb DL16DL45.529.6312.49
Spatial DL1748.948.6868.18
Temporal DL18000
Spatial DL19NC0NC
Spatial DL20NC0NC
High Flow
Temporal DH1314543355920
Temporalac DH22379.173050.834268.33
Temporal DH31632.212038.212504.39
Temporal DH4824.021037.131125.9
Temporal DH5567.58688.55849.3
Spatial DH641.8747.9857.44
Spatial DH739.6643.549.95
Spatialb DH8DH233.2833.4841.55
Spatial DH926.1526.0533.42
Spatial DH1025.3725.6729.39
Temporal DH1115.7324.2429.6
Temporal DH128.1610.5612.52
Spatialb DH13DH24.125.065.63
Spatial DH140.10.160.21
Temporal DH154.625.456.67
Spatial DH1630.5629.1846.84
Temporal DH1710.6214.3521.84
Temporal DH1833.724
Temporal DH191.7122.32
Temporalb DH20DH24.625.456.67
Temporal DH2122.0226.6538.69
Temporal DH2258181309.13
Temporal DH23111
Temporal DH2481169.5327
Index Type
Average FlowSurrogate for
Spatial TA10.430.530.55
Spatial TA257.7461.964.06
Spatial TA30.250.440.36
Low Flow
Spatiala TL1246.84255.04262.49
Spatial TL232.1745.5941.58
Spatial TL30.460.550.6
Spatial TL40.020.020.04
High Flow
Spatiala TH142.829.7170.44
Spatial TH264.5171.1971.59
Spatial TH30.120.170.38
Rate of Change
Index Type
Average FlowSurrogate for
Temporal RA1835210
Spatial RA2211.25218.58271.7
Temporalac RA3-77-25-9
Spatial RA4-289.34-270.38-225.38
Spatialb RA5RA30.280.290.31
Temporal RA60.070.190.54
Temporalb RA7RA3-0.23-0.13-0.07
Temporalb RA8RA3102110121.75
Spatial RA97.9110.9511.49

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