Ipswich River main-stem and tributary samples collected and analyzed by MBL (July 1998 to July 1999)											
											
Sample	description	Category	Date	Sample #	NH4 (mM)	NO3 (mM)	TDN (mM)	PO4 (mM)	TDP (mM)	River km	
MBL	Central St.	BASE	2-Jul-98	IPS-31	13.7	2.0	76.6	0.53	2.10	43.9	
MBL	Haverhill St. (N. Reading)	BASE	2-Jul-98	IPS-30	15.4	2.4	85.8	0.73	0.98	43.0	
MBL	Rt-62 (N. Reading)	BASE	2-Jul-98	IPS-28	14.5	3.0	94.1	0.58	0.73	41.7	
MBL	Cerveza Bridge	BASE	2-Jul-98	IPS-27	15.8	3.9	87.2	0.78	1.04	41.1	
MBL	Pumping Station	BASE	2-Jul-98	IPS-26	15.0	6.2	93.4	0.47	1.17	38.7	
MBL	Bostik Chem. Plant	BASE	2-Jul-98	IPS-25	14.6	7.5	76.4	0.58	0.98	36.7	
MBL	Rt-114 in Middleton	BASE	2-Jul-98	IPS-22	8.5	11.1	78.5	0.68	2.29	31.9	
MBL	Near Middleton Colony	BASE	2-Jul-98	IPS-20	6.4	13.0	74.0	0.78	2.10	29.1	
MBL	Rt-62 Middleton	BASE	2-Jul-98	IPS-19	4.8	13.6	91.9	0.78	1.42	28.1	
MBL	Thunder Bridge	BASE	2-Jul-98	IPS-15	4.4	12.7	68.3	0.42	1.36	23.9	
MBL	Rowley Bridge	BASE	2-Jul-98	IPS-12	3.5	11.0	69.3	0.42	1.36	21.4	
MBL	Rt-97	BASE	2-Jul-98	IPS-10	5.9	11.3	60.0	0.53	1.04	18.0	
MBL	"Wenham swamp,Pine Island"	BASE	2-Jul-98	IPS-9	2.0	9.8	63.7	0.42	0.80	13.3	
MBL	Asbury Rd.	BASE	2-Jul-98	IPS-6	5.6	2.3	60.1	0.27	0.86	9.9
MBL	Foote Bros Canoe	BASE	2-Jul-98	IPS-5	5.2	3.0	70.6	0.27	1.11	7.3
MBL	Central St.	BASE	22-Jul-98	IPS-31	11.3	29.7	138.9	0.34	0.98	43.9
MBL	Rt-62 (N. Reading)	BASE	22-Jul-98	IPS-28	12.8	35.7	118.1	0.44	3.35	41.7
MBL	Pumping Station	BASE	22-Jul-98	IPS-26	5.7	38.4	132.2	0.63	2.54	38.7
MBL	Bostik Chem. Plant	BASE	22-Jul-98	IPS-25	4.7	35.9	104.2	0.54	1.67	36.7
MBL	Hilldale Av.	BASE	22-Jul-98	IPS-24	2.9	42.8	109.0	0.88	2.42	34.7
MBL	Log Bridge Rd.	BASE	22-Jul-98	IPS-21	6.4	25.9	103.6	0.93	1.36	31.3
MBL	Rt-62 - Middleton	BASE	22-Jul-98	IPS-19	3.8	35.1	112.3	0.73	1.86	28.1
MBL	Peabody St.	BASE	22-Jul-98	IPS-16	2.6	24.6	116.9	0.68	1.98	24.9
MBL	Thunder Bridge	BASE	22-Jul-98	IPS-15	2.4	51.2	113.6	0.78	2.85	23.9
MBL	I-95	BASE	22-Jul-98	IPS-14	3.5	34.1	111.9	0.73	2.42	23.0
MBL	Rowley Bridge	BASE	22-Jul-98	IPS-12	3.9	27.2	105.7	0.58	1.73	21.4
MBL	Salem Rd. (edge)	BASE	22-Jul-98	IPS-11	3.7	40.6	101.3	0.49	1.79	19.5
MBL	Rt-97	BASE	22-Jul-98	IPS-10	4.0	39.4	100.8	0.73	1.36	18.0
MBL	Green Meadow Farm	BASE	22-Jul-98	IPS-9	8.8	29.1	122.9	0.54	2.73	13.3
MBL	Asbury Rd	BASE	22-Jul-98	IPS-6	14.8	27.3	125.4	0.44	1.92	9.9
MBL	Winthrop Rd	BASE	22-Jul-98	IPS-4	11.5	18.5	142.4	0.49	1.42	7.3
MBL	Mill Rd	BASE	22-Jul-98	IPS-3	9.0	43.9	125.8	0.44	1.54	4.1
MBL	Ipswich Dam	BASE	22-Jul-98	IPS-1	7.1	40.0	118.8	0.63	1.79	0.0
MBL	Martins Brook	BASE	22-Jul-98	IPS-32	13.3	16.6	97.8	0.39	1.48	44.9
MBL	Norris Brook	BASE	22-Jul-98	IPS-23	4.3	13.5	50.4	0.63	1.11	33.3
MBL	Mill Pond Brook	BASE	22-Jul-98	IPS-18	4.0	1.5	69.7	0.24	0.92	25.7
MBL	Boston Brook	BASE	22-Jul-98	IPS-17	3.9	5.4	60.9	0.24	0.98	25.7
MBL	Fish Brook	BASE	22-Jul-98	IPS-13	1.7	26.8	67.7	0.05	0.67	21.5
MBL	Mile Brook	BASE	22-Jul-98	IPS-8	1.4	0.5	44.3	0.05	0.61	12.9
MBL	Howlett Brook	BASE	22-Jul-98	IPS-7	6.6	12.4	59.2	0.24	0.92	9.9
MBL	Miles River	BASE	22-Jul-98	IPS-2	5.9	5.0	69.7	0.24	1.54	2.2
MBL	Central St	BASE	3-Aug-98	IPS-31	3.8	8.1	101.4	0.78	2.29	43.9
MBL	Washington St.	BASE	3-Aug-98	IPS-29	5.4	11.5	103.7	0.44	2.23	42.2
MBL	Pumping Station	BASE	3-Aug-98	IPS-26	4.5	24.9	92.9	0.63	2.04	38.7
MBL	Bostik Chem. Plant	BASE	3-Aug-98	IPS-25	4.4	19.0	104.7	0.44	1.61	36.7
MBL	Hilldale Av.	BASE	3-Aug-98	IPS-24	2.9	24.5	104.5	0.44	3.66	34.7
MBL	Log Bridge Rd	BASE	3-Aug-98	IPS-21	3.2	6.7	103.6	0.63	1.79	31.3
MBL	Rt 62 - Middleton	BASE	3-Aug-98	IPS-19	2.8	17.3	57.3	0.54	1.79	28.1
MBL	Peabody St.	BASE	3-Aug-98	IPS-16	2.0	15.6	95.6	0.49	1.98	24.9
MBL	Thunder Bridge	BASE	3-Aug-98	IPS-15	1.8	23.9	92.5	0.73	2.23	23.9
MBL	I-95	BASE	3-Aug-98	IPS-14	2.3	26.6	99.1	0.78	2.04	23.0
MBL	Rowley Bridge	BASE	3-Aug-98	IPS-12	2.0	15.9	97.0	0.68	1.61	21.4
MBL	Salem Rd.	BASE	3-Aug-98	IPS-11	2.1	27.3	87.5	0.49	1.79	19.5
MBL	Rt-97	BASE	3-Aug-98	IPS-10	2.5	7.2	90.0	0.63	1.73	18.0
MBL	Green Meadow Farm	BASE	3-Aug-98	IPS-9	5.8	16.8	97.5	0.63	2.04	13.3
MBL	Asbury Rd.	BASE	3-Aug-98	IPS-6	3.6	28.1	100.3	0.63	1.36	9.9
MBL	Winthrop St.	BASE	3-Aug-98	IPS-4	3.4	10.8	97.3	0.63	0.92	7.3
MBL	Norris Brook	BASE	3-Aug-98	IPS-23	2.7	6.0	52.9	0.63	0.98	33.3
MBL	Fish Brook	BASE	3-Aug-98	IPS-13	2.3	21.1	69.8	0.24	0.67	21.5
MBL	Mile Brook	BASE	3-Aug-98	IPS-8	1.2	0.4	42.6	0.10	0.73	12.9
MBL	Howlett Brook	BASE	3-Aug-98	IPS-7	4.7	4.2	57.8	0.19	1.23	9.9
MBL	Woburn St.	BASE	7-Dec-98	na	3.3	19.2	39.4	0.07	0.66	50.5
MBL	Main St. (Rt 28)	BASE	7-Dec-98	na	3.2	16.1	44.7	0.11	0.64	46.0
MBL	Central St.	BASE	7-Dec-98	na	4.5	17.7	54.6	0.12	0.65	43.9
MBL	Washington St.	BASE	7-Dec-98	na	4.6	18.8	55.0	0.10	0.68	42.2
MBL	Pumping Station	BASE	7-Dec-98	na	4.2	18.9	53.6	0.16	0.69	38.7
MBL	Bostik Plant	BASE	7-Dec-98	na	3.9	20.2	54.4	0.10	0.67	36.7
MBL	Hilldale Ave.	BASE	7-Dec-98	na	3.5	22.4	56.8	0.26	0.70	34.7
MBL	Log Bridge Rd.	BASE	7-Dec-98	na	4.2	22.4	43.1	0.19	0.69	31.3
MBL	Rt. 62	BASE	7-Dec-98	na	4.5	30.8	61.5	0.18	0.75	28.1
MBL	Peabody St.	BASE	7-Dec-98	na	3.6	27.4	57.8	0.21	0.72	24.9
MBL	Rowley Bridge	BASE	7-Dec-98	na	2.8	25.0	53.4	0.17	0.67	21.4
MBL	Salem Rd.	BASE	7-Dec-98	na	3.2	28.7	56.1	0.24	0.70	19.5
MBL	Rt. 97	BASE	7-Dec-98	na	3.1	29.6	57.8	0.10	0.78	18.0
MBL	Green Meadow Farm	BASE	7-Dec-98	na	4.3	26.4	59.0	0.09	0.67	13.3
MBL	Asbury Rd.	BASE	7-Dec-98	na	4.6	23.9	55.9	0.23	0.75	9.9
MBL	Winthrop St.	BASE	7-Dec-98	na	3.8	22.4	55.1	0.21	0.73	7.3
MBL	Mill Road	BASE	7-Dec-98	na	3.1	21.8	56.8	0.25	0.80	4.1
MBL	Dam in Ipswich	BASE	7-Dec-98	na	2.8	24.0	57.5	0.26	0.73	0.0
MBL	Bear Meadow Brook	BASE	7-Dec-98	na	1.8	6.7	98.8	0.28	0.57	45.6
MBL	Martins Brook	BASE	7-Dec-98	na	5.9	20.0	51.7	0.11	0.75	44.9
MBL	Norris Brook	BASE	7-Dec-98	na	6.6	35.3	50.7	0.14	0.60	33.3
MBL	Mill Pond Brook	BASE	7-Dec-98	na	13.0	6.7	67.6	0.13	0.73	25.7
MBL	Boston Brook	BASE	7-Dec-98	na	1.1	5.1	27.5	0.08	0.53	25.7
MBL	Fish Brook	BASE	7-Dec-98	na	1.5	19.4	48.2	0.18	0.64	21.5
MBL	Howlett Brook	BASE	7-Dec-98	na	4.4	15.6	36.3	0.15	0.63	9.9
MBL	Black Brook	BASE	7-Dec-98	na	2.6	176.3	220.1	0.27	0.90	6.1
MBL	Miles River	BASE	7-Dec-98	na	2.1	16.6	47.6	0.17	0.72	2.2
MBL	Cook Rd. (Burlington) - Lubbers Brook	BASE	7-Dec-98	na	8.4	64.7	84.8	0.09	0.59	61.5
MBL	Rt-38 (Wilmington) - Lubbers Brook	BASE	7-Dec-98	na	7.3	18.7	44.7	0.16	0.63	56.4
MBL	Rt-62 (Wilmington) - Lubbers Brook	BASE	7-Dec-98	na	1.0	4.4	33.3	0.09	0.65	53.0
MBL	Rt-62 Wilmington Rd. - Mill Brook	BASE	7-Dec-98	na	3.4	13.4	31.1	0.21	0.78	58.7
MBL	Westwood St. - Mill Brook	BASE	7-Dec-98	na	4.9	24.1	39.4	0.29	0.64	57.6
MBL	Rt-62 Burlington Av. - Mill Brook	BASE	7-Dec-98	na	2.8	32.9	52.0	0.15	0.69	55.5
MBL	Rt-38 Main St. - Mill Brook	BASE	7-Dec-98	na	3.7	26.0	46.3	0.13	0.73	54.2
MBL	Adams St. - Mill Brook	BASE	7-Dec-98	na	3.2	32.7	52.8	0.20	0.64	52.8
MBL	Playground - Sawmill Brook	BASE	7-Dec-98	na	4.9	30.4	43.0	0.10	0.55	58.2
MBL	Mill St. - Sawmill Brook	BASE	7-Dec-98	na	3.9	30.5	48.5	0.19	0.57	57.3
MBL	A- Frame house - Sawmill Brook	BASE	7-Dec-98	na	2.4	28.6	47.1	0.16	0.72	56.7
MBL	Chestnut St. - Sawmill Brook	BASE	7-Dec-98	na	2.9	25.6	45.9	0.11	0.64	55.9
MBL	The Dump - Maple Meadow Brook	BASE	7-Dec-98	na	12.4	39.8	65.1	0.07	0.45	55.9
MBL	Abandoned canal - Maple Meadow Brook	BASE	7-Dec-98	na	3.2	4.9	27.8	0.04	0.56	54.8
MBL	Woburn St.	BASE	7-Apr-99	na	0.7	12.2	44.4	0.60	0.60	50.5
MBL	Main St. (Rt 28)	BASE	7-Apr-99	na	1.4	8.2	45.0	0.35	0.45	46.0
MBL	Central St.	BASE	7-Apr-99	na	1.7	10.0	44.1	0.36	0.36	43.9
MBL	Washington St.	BASE	7-Apr-99	na	1.9	12.3	47.2	0.40	0.50	42.2
MBL	Pumping Station	BASE	7-Apr-99	na	1.8	13.6	49.0	0.38	0.45	38.7
MBL	Bostik Plant	BASE	7-Apr-99	na	1.9	13.5	50.3	0.37	0.70	36.7
MBL	Hilldale Ave.	BASE	7-Apr-99	na	1.5	22.4	48.2	0.36	0.45	34.7
MBL	Log Bridge Rd.	BASE	7-Apr-99	na	1.3	21.6	35.7	0.38	0.45	31.3
MBL	Rt. 62	BASE	7-Apr-99	na	1.4	33.3	58.4	0.38	0.53	28.1
MBL	Peabody St.	BASE	7-Apr-99	na	1.5	20.2	45.5	0.37	0.51	24.9
MBL	Rowley Bridge	BASE	7-Apr-99	na	1.0	24.3	42.1	0.33	0.48	21.4
MBL	Salem Rd.	BASE	7-Apr-99	na	1.2	21.7	47.3	0.35	0.44	19.5
MBL	Rt. 97	BASE	7-Apr-99	na	1.0	22.8	31.3	0.32	0.42	18.0
MBL	Green Meadow Farm	BASE	7-Apr-99	na	1.0	10.9	61.5	0.38	0.68	13.3
MBL	Asbury Rd.	BASE	7-Apr-99	na	0.6	11.8	30.0	0.33	0.42	9.9
MBL	Winthrop St.	BASE	7-Apr-99	na	0.6	11.3	50.4	0.37	0.42	7.3
MBL	Mill Road	BASE	7-Apr-99	na	0.4	10.8	43.6	0.36	0.45	4.1
MBL	Dam in Ipswich	BASE	7-Apr-99	na	0.3	10.8	38.7	0.36	0.64	0.0
MBL	Bear Meadow Brook	BASE	7-Apr-99	na	1.4	6.2	65.9	0.45	0.59	45.6
MBL	Martins Brook	BASE	7-Apr-99	na	1.2	13.8	43.5	0.36	0.48	44.9
MBL	Norris Brook	BASE	7-Apr-99	na	0.6	16.1	27.2	0.35	0.35	33.3
MBL	Mill Pond Brook	BASE	7-Apr-99	na	0.4	0.8	33.6	0.31	0.39	25.7
MBL	Boston Brook	BASE	7-Apr-99	na	0.3	2.2	32.5	0.34	0.42	25.7
MBL	Fish Brook	BASE	7-Apr-99	na	1.2	20.9	38.3	0.36	0.48	21.5
MBL	Howlett Brook	BASE	7-Apr-99	na	0.9	17.8	33.8	0.33	0.39	9.9
MBL	Black Brook	BASE	7-Apr-99	na	2.9	104.8	139.8	0.49	0.82	6.1
MBL	Miles River	BASE	7-Apr-99	na	0.7	16.0	54.7	0.37	0.50	2.2
MBL	Mill St. - Sawmill Brook	BASE	7-Apr-99	na	6.9	62.4	89.3	0.42	0.42	57.3
MBL	Chestnut St. - Sawmill Brook	BASE	7-Apr-99	na	2.8	53.4	66.0	0.42	0.42	55.9
MBL	Abandoned canal - Maple Meadow Brook	BASE	7-Apr-99	na	2.0	10.4	34.3	0.35	0.39	54.8
MBL	Woburn St.	BASE	6-Jul-99	na	0.8	20.5	na	1.09	na	50.5
MBL	Main St. (Rt 28)	BASE	6-Jul-99	na	28.3	50.7	na	0.91	na	46.0
MBL	Central St.	BASE	6-Jul-99	na	4.3	47.0	na	0.50	na	43.9
MBL	Washington St.	BASE	6-Jul-99	na	13.9	31.3	na	4.55	na	42.2
MBL	Pumping Station	BASE	6-Jul-99	na	2.4	7.6	na	0.48	na	38.7
MBL	Bostik Plant	BASE	6-Jul-99	na	2.7	26.1	na	0.68	na	36.7
MBL	Hilldale Ave.	BASE	6-Jul-99	na	4.5	29.2	na	0.68	na	34.7
MBL	Log Bridge Rd.	BASE	6-Jul-99	na	3.7	9.8	na	1.53	na	31.3
MBL	Rt. 62	BASE	6-Jul-99	na	1.8	15.0	na	1.17	na	28.1
MBL	Peabody St.	BASE	6-Jul-99	na	2.5	17.7	na	0.81	na	24.9
MBL	Rowley Bridge	BASE	6-Jul-99	na	3.8	27.2	na	0.86	na	21.4
MBL	Salem Rd.	BASE	6-Jul-99	na	4.3	25.0	na	0.81	na	19.5
MBL	Rt. 97	BASE	6-Jul-99	na	4.7	24.1	na	0.69	na	18.0
MBL	Green Meadow Farm	BASE	6-Jul-99	na	5.2	18.9	na	0.97	na	13.3
MBL	Asbury Rd.	BASE	6-Jul-99	na	1.8	14.1	na	0.93	na	9.9
MBL	Winthrop St.	BASE	6-Jul-99	na	1.3	10.4	na	0.89	na	7.3
MBL	Mill Road	BASE	6-Jul-99	na	2.6	12.2	na	0.50	na	4.1
MBL	Dam in Ipswich	BASE	6-Jul-99	na	0.3	0.8	na	0.65	na	0.0
MBL	Bear Meadow Brook	BASE	6-Jul-99	na	20.5	19.5	na	4.35	na	45.6
MBL	Martins Brook	BASE	6-Jul-99	na	2.1	41.3	na	0.74	na	44.9
MBL	Norris Brook	BASE	6-Jul-99	na	5.0	11.4	na	2.09	na	33.3
MBL	Mill Pond Brook	BASE	6-Jul-99	na	5.4	8.3	na	0.51	na	25.7
MBL	Boston Brook	BASE	6-Jul-99	na	7.6	8.6	na	0.34	na	25.7
MBL	Fish Brook	BASE	6-Jul-99	na	2.8	32.7	na	0.61	na	21.5
MBL	Howlett Brook	BASE	6-Jul-99	na	3.2	25.3	na	0.81	na	9.9
MBL	Black Brook	BASE	6-Jul-99	na	11.8	346.3	na	0.69	na	6.1
MBL	Miles River	BASE	6-Jul-99	na	4.9	15.4	na	1.64	na	2.2
MBL	Mill St. - Sawmill Brook	BASE	6-Jul-99	na	12.3	47.9	na	0.62	na	57.3
MBL	Chestnut St. - Sawmill Brook	BASE	6-Jul-99	na	18.9	26.2	na	0.79	na	55.9