Merrimack and Souhegan Rivers
E-Coli Bacteria in Colonies per 100 ml. of Sample
Bacteria levels below 88 colonies per 100 ml. are considered safe for public swimming areas. Therefore levels above 88 colonies per 100 ml. are colored in red.
CFS: The water flow volume in the rivers is measured in Cubic Feet per Second.
TNC: To numerous to count.
NA: Entries labeled NA are not available. The e-coli counts are either not available because of a contaminated, lost, or destroyed sample, or because no one collected the water sample. There may be no volunteer for a particular site, or a volunteer might have been out of town or unable to collect the sample. If you wish to help reduce the number of N/A entries and can collect a few water samples on a Tuesday morning, call George May at 883-3409 or email georgemay (at) comcast (dot) net.
| Water Sampling Dates | ||||||||
|---|---|---|---|---|---|---|---|---|
| Locations and Measurements | 6/8/10 | 6/22/10 | 7/6/10 | 7/20/10 | 8/3/10 | 8/17/10 | 8/31/10 | 9/14/10 |
Souhegan River Sites |
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| Ashburnham, Ma Billy Ward Pond |
N/A | N/A | 16 | 16 | ||||
| New Ipswich River Road above Water Loom Pond |
N/A | N/A | 16 | 18 | ||||
| New Ipswich Highbridge |
145 | 8 | 17 | 56 | ||||
| Greenville Above Greenville Mill Pond |
77 | N/A | 21 | 24 | ||||
| Greenville Downtown Greenville upstream of WWTP |
75 | 14 | 6 | 50 | ||||
| Greenville Green Bridge below Greenville WWTP |
96 | 45 | 10 | 37 | ||||
| Wilton Below the Horseshoe |
121 | 18 | 83 | N/A | ||||
| Wilton Downtown |
N/A | N/A | N/A | 326 | ||||
| Milford Pine Valley Mill |
365 | 96 | 142 | N/A | ||||
| Milford Behind Hayward Field |
435 | 135 | 225 | 124 | ||||
| Milford Souhegan Valley Boys & Girls Club |
517 | 326 | 225 | 179 | ||||
| Milford Swing Bridge |
579 | 166 | 53 | N/A | ||||
| Milford Behind Riverside Cemetery |
461 | 194 | 86 | 201 | ||||
| Milford Behind Lorden Plaza |
649 | 108 | 82 | 214 | ||||
| Amherst Amherst Country Club |
517 | 121 | 122 | 236 | ||||
| Amherst Conservation land on Fairway Road |
687 | 140 | 124 | 261 | ||||
| Amherst Boston Post Road Canoeport |
687 | 194 | 107 | 261 | * | |||
| Merrimack Indian Ledges, Davidson Road |
727 | 40 | 26 | 33 | ||||
| Merrimack Turkey Hill Bridge |
613 | 145 | 66 | 64 | ||||
| Merrimack DW Highway |
225 | 51 | 31 | 38 | ||||
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| Lyndeborough/Mont Vernon |
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| Manchester Above Amoskeag Dam |
142 | N/A | 13 | N/A | ||||
| Manchester Arms Park |
111 | N/A | 33 | N/A | ||||
| Manchester Upstream of Piscataquag River |
N/A | N/A | N/A | N/A | ||||
| Litchfield Goffs Falls |
N/A | 18 | 43 | 1046 | ||||
| Merrimack Depot Street |
N/A | 7 | 30 | 365 | ||||
| Merrimack Upstream of Souhegan River |
N/A | 26 | 166 | N/A | ||||
| Merrimack Thornton's Ferry Boat Ramp |
71 | 38 | 31 | 31 | ||||
| Nashua Greeley Park Boat Ramp |
179 | 33 | N/A | 33 | ||||
| Nashua Taylors Falls Bridge |
120 | 40 | 34 | 13 | ||||
| Nashua Sagamore Bridge |
133 | 37 | 19 | 7 | ||||
| Hudson Pheasant Lane Mall |
N/A | N/A | N/A | N/A | ||||
| Tyngsboro Upstream of Tyngsboro Bridge |
224 | 328 | 517 | 8 | ||||
| Upper Souhegan current/historic flow (CFS) | 90/65 | 34/30 | 17/38 | |||||
| Lower Souhegan current/historic flow (CFS) | 203/130 | 72/108 | 43/67 | |||||
| Merrimack current/historic flow (CFS) | 4340/3610 | 1880/2700 | 1360/1970 | |||||
| Rainfall | Some on Sunday | None. | ||||||
| Air Temperature | ||||||||
| Water Temperature: Merr. Souh. |
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| Location | 7/17/10 | |||||||
| Pepperell, Ma Covered Bridge |
50 | |||||||
| Pepperell, Ma Canoe Launch |
43 | |||||||
| Hollis Runnels Bridge |
48 | |||||||
| Nashua Mine Falls Park |
N/A | |||||||
| Nashua Canal Street |
N/A | |||||||
| Brookline Lancy Brook |
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| Brookline Nissitisit River |
68 | |||||||
| West Hollis Nissitisit River |
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| Mason Walker Brook |
205 | |||||||
| Greenville Branch Walker Brook |
1553 | |||||||
Notes:
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