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.
N/A: Entries labeled N/A are not available. The e-coli counts are usually not available 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) msn (dot) com.
| Water Sampling Dates | ||||||||
|---|---|---|---|---|---|---|---|---|
| Locations and Measurements | 6/8/04 | 6/22/04 | 7/6/04 | 7/20/04 | 8/3/04 | 8/17/04 | 8/31/04 | 9/14/04 |
Souhegan River Sites |
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| New Ipswich River Road above Water Loom Pond |
0 | 66 | 0 | 96 | 72 | 120 | 30 | |
| New Ipswich Highbridge |
0 | 19 | 0 | N/A | 0 | 80 | N/A | |
| Greenville Above Greenville Mill Pond |
0 | 16 | 0 | 64 | 38 | 78 | 40 | |
| Greenville Downtown Greenville upstream of WWTP |
N/A | 20 | 0 | 148 | 0 | N/A | 36 | |
| Greenville Green Bridge below Greenville WWTP |
0 | 31 | 0 | 112 | 74 | N/A | 23 | |
| Wilton Below the Horseshoe |
25 | 94 | 14 | 56 | 10 | 240 | N/A | |
| Wilton Downtown |
125 | 460 | N/A | 400 | 208 | 542 | 490 | |
| Milford Pine Valley Mill |
70 | 195 | 125 | 550 | 28 | 369 | 640 | |
| Milford Milford Drive-in |
59 | 424 | 65 | |||||
| Milford Behind Hayward Field |
133 | 130 | N/A | 360 | 23 | 398 | 180 | |
| Milford Below Hartshorn Brook |
12 | 248 | 30 | |||||
| Milford Souhegan Valley Boys & Girls Club |
31 | 170 | 116 | 410 | 52 | 245 | 300 | |
| Milford Emerson Park |
97 | 170 | N/A | |||||
| Milford Swing Bridge |
39 | 160 | 126 | 780 | 124 | 447 | 415 | |
| Milford Below McLane Dam |
50 | 282 | N/A | |||||
| Milford Behind Riverside Cemetery |
100 | 125 | 225 | 620 | 86 | 400 | 280 | |
| Milford Behind Lorden Plaza |
170 | 150 | 400 | 800 | 121 | 738 | 120 | |
| Amherst Amherst Country Club |
60 | 162 | 325 | 650 | 71 | 407 | 600 | |
| Amherst Above Beaver Brook |
56 | 511 | N/A | |||||
| Amherst Conservation land on Fairway Road |
500 | 405 | 220 | N/A | 80 | 453 | 168 | |
| Amherst Upstream of Boston Post Road (far field) |
95 | 286 | N/A | |||||
| Amherst Upstream of Boston Post Road (near field) |
113 | 495 | N/A | |||||
| Amherst Boston Post Road Canoeport |
100 | 156 | 220 | 480 | 90 | 245 | 215 | |
| Amherst Thorntons Ferry Road II |
70 | 190 | N/A | |||||
| Merrimack Fields/Seaverns Bridge |
97 | N/A | N/A | |||||
| Merrimack Indian Ledges, Davidson Road |
80 | 90 | 85 | 120 | 40 | 100 | 340 | |
| Merrimack Turkey Hill Bridge |
31 | 14 | 30 | 170 | 15 | 230 | 344 | |
| Merrimack East Chamberlain Rd. |
N/A | N/A | 6 | 87 | 15 | 250 | N/A | |
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| Manchester Above Amoskeag Dam |
14 | 17 | 8 | 20 | 48 | 10 | ||
| Manchester Arms Park |
6 | 50 | 10 | 44 | 24 | 80 | ||
| Manchester Upstream of Piscataquag River |
N/A | 17 | 2 | 31 | 38 | 96 | ||
| Litchfield Goffs Falls |
4 | 58 | 2 | 64 | N/A | 160 | ||
| Merrimack Depot Street |
8 | 58 | 6 | N/A | 16 | 80 | ||
| Merrimack Upstream of Souhegan River |
N/A | 45 | 6 | 77 | 11 | 130 | ||
| Merrimack Thornton's Ferry |
224 | 50 | 20 | 134 | 30 | 48 | ||
| Nashua Greeley Park |
72 | 22 | 10 | 320 | N/A | N/A | ||
| Nashua Taylors Falls Bridge |
72 | 54 | 34 | 340 | 146 | 104 | ||
| Nashua Sagamore Bridge |
460 | 56 | 118 | 160 | 36 | 132 | ||
| Hudson Sanders Parking Lot |
N/A | N/A | N/A | N/A | N/A | N/A | ||
| Tyngsboro Upstream of Tyngsboro Bridge |
N/A | N/A | 16 | 86 | N/A | 100 | ||
| Souhegan current/historic flow (CFS) | 168/138 | 84/104 | 52/64 | 91/47 | 41/43 | 56/37 | 47/39 | |
| Merrimack current/historic flow (CFS) | 5669/3640 | 1710/2780 | 1590/1920 | 2730/1560 | 3130/1739 | 2240/1490 | ||
| Rainfall | Insig. | up to 1" | Insig. | |||||
| Air Temperature | 19 oC/66 oF | 22 oC/72 oF | 20 oC/68 oF | 20 oC/68 oF | ||||
| Water Temperature: Merr. Souh. |
16 oC/61 oF | 23 oC/73 oF 18 oC/64 oF |
24 oC/75 oF 20 oC/68 oF |
26 oC/79 oF 23 oC/73 oF |
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Notes:
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