Plum Island Ecosystems LTER Database

Acceptance and utilization of LTER data requires that:

(1) The Principal Investigator be sent a notice stating reasons for acquiring any data and a description of the publication intentions.
(2) The Principal Investigator of the data set be sent a copy of the report or manuscript prior to submission and be adequately cited in any resultant publications.
(3) A copy of any resultant publications should be sent to:

Principal Investigator
Ecosystems Center
Marine Biological Laboratory
7 MBL St.
Woods Hole, MA 02543

Dataset URLs:METADATA: HTML, Rich Text, XML(EML compliant)
DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:WAT-IP-MonthlySampling.01
Dataset Title:Nutrient data set for the Ipswich River main stem, major tributaries, and headwaters from March 1999 to May 2001.
Investigator 1: 
First Name:Charles
Last Name:Hopkinson
Address line 1:Ecosystems Center
Address line 2:MBL
Address line 3:7 MBL St
City:Woods Hole
Zip Code:02543
Associate Investigators:Ed Rastetter, Joe Vallino, Michael Williams, Solange Filoso, Luc Claessens, Jeff Evans
Keywords:PIE LTER, inorganic nutrients, Ipswich River, ammonium, nitrate, nitrogen, phosphate, phosphorus, watershed
Abstract:Nutrient data set for the Ipswich River main stem, major tributaries, and headwaters. Data are from base flow conditions (BASE), except were indicated as storm flow (EVENT). Samplings were from March 1999 to May 2001, collected by the Ipswich River Watershed Association (IRWA) and analyzed at MBL
Contact: Plum Island Ecosystems LTER Information Manager
The Ecosystems Center
Marine Biological Lab
7 MBL St
Woods Hole, MA 02543
Phone (508) 289 7485
Online URL:
Data File URL
Data File Name WAT-IP-MonthlySampling
Beginning Date 3/28/1999
End Date 5/27/2001
Number of Data Records 635
Other Files to Reference
Availability Status Type 1
Quality Control Information
Maintenance Description
Log of Changes:
Geographic Description Ipswich River watershed, Massachusetts  
Location Bounding Box    
West Bounding Coordinate -71.3343127  
East Bounding Coordinate -70.7134174  
North Bounding Coordinate 42.4465968  
South Bounding Coordinate 42.7602526  
OR if single point location    
Taxonomic Protocols
Organisms studied
Methods:Station names and locations

Station ID Location River km Town Location
Main Stem Ipswich River STATE X STATE Y
IP00 Woburn Street 50.486 Wilmington 229261 922641
IP01 Mill Street 46.471 Reading 231973 923476
IP03 Central Street 43.924 North Reading 233673 924718
IP04 Route 62 41.709 North Reading 235314 925186
IR-PS Pumping Station 38.67 North Reading 237134 924693
IP06 Bostik 36.728 Middleton 238657 924466
Hilldale Hilldale Avenue 34.698 Middleton 240318 923859
IP08 Log Bridge Road (West St.) 31.317 Middleton 241607 925387
IP10 Route 62 28.072 Middleton 241318 927369
IP11 Peabody Street 24.85 Middleton 241264 929664
IP13 Rowley Bridge Road 21.374 Topsfield 243730 930853
IP14 Salem Road 19.487 Topsfield 245138 930709
IR-97 Route 97 17.988 Topsfield 246323 930525
IP16 IRWS - Boat Launch 15.309 Topsfield 247653 930787
IP18 Asbury Road 9.857 Topsfield 248221 933850
IP20 Winthrop Street 7.341 Ipswich 249961 934438
IP22 Mill Road 4.054 Ipswich 252322 934396
IP24 Sylvania Dam 0 Ipswich 254279 936547

Main Stem Tributaries
MB01 Martins Brook at Park St. 44.906 North Reading 232739 924632
BB Boston Brook at Peabody St. 25.683 Middleton 240744 929741
FB-BV Fish Brook at Brookview Rd. 21.468 Boxford 238700 935037
FB-MI Fish Brook at Middleton Rd. 21.468 Boxford 240634 934316
FB-WA Fish Brook at Washington St. 21.468 Boxford 243166 931249
HB-01 Howlett Brook at Ipswich Rd. 9.878 Topsfield 247794 933994
MR-1A Miles River at County Rd. 2.176 Ipswich 253852 934390
GC Green wood Creek Ipswich

Upper Ipswich River Tributaries
LB Lubbers Brook at Glen Rd. 56.116 Wilmington 226040 923979
MMB Maple Meadow Brook at Wildwood St. 52.054 Wilmington 228204 922522

Data Table

Variable Name Variable Description Units Measurement Scale Code Information Number Type DateTime Format Missing Value Code Missing Value Code Explanation
Sample collector Group that collected sample   nominal       blank no data
StationID Station identification   nominal       blank no data
Location Sample location description or name   nominal       blank no data
River km at Dam Distance from Sylvania Dam, Ipswich, MA (0 km) kilometer ratio   real   blank no data
Town Town that sample was collected in   nominal       blank no data
STATE X x coordinates (meters) in MA state plane NAD 83 meter ratio   real   blank no data
STATE Y y coordinates (meters) in MA state plane NAD 83 meter ratio   real   blank no data
CATEGORY condition of stream flow   nominal BASE = base stream flow | EVENT = storm stream flow event     blank no data
Date Date sample was collected   datetime     dd-mmm-yyyy blank no data
Sample number Sample number identification   nominal       blank no data
NH4 Ammonium concentration as NH4-N microMolesPerLiter ratio   real   blank no data
NO3 Nitrate concentration as NO3-N microMolesPerLiter ratio   real   blank no data
TDN Total dissolved nitrogen concentration as N microMolesPerLiter ratio   real   blank no data
PO4 Phosphate concentration as PO4-P microMolesPerLiter ratio   real   blank no data
TDP Total dissolved phosphorus concentration as P microMolesPerLiter ratio   real   blank no data
Cl Chloride concentration as Cl microMolesPerLiter ratio   real   blank no data
SO4 Sulfate concentration as SO4-S microMolesPerLiter ratio   real   blank no data
Comments Information pertaining to individual data points   nominal       blank no data