August 25th

 

MERRIMACK RIVER IS CLEAN

 

Warmer temperatures and lower flows in the Souhegan and Merrimack Rivers are producing generally expected seasonal E. coli readings in both rivers according to the latest test done by the Souhegan Watershed Association.

 

The Merrimack River, once again, tested clean for E. coli bacteria throughout the testing range, between Manchester and Tyngsborough. None of the twelve sites tested along the river exceeded the level for swimming beaches in NH. This has been the story all summer long, and over the last several years as the river has cleaned up nicely.

 

The Souhegan is a much smaller river and reflects any pollution more quickly. The upper stretch of the river tested OK as far as Wilton, but from Wilton through Milford and Amherst E. coli counts were in the 200 range. This is well above the 88 limit required for clean beaches and swimmers would be advised to stay out of the water in this stretch until the counts come down. Levels higher than 88 may cause swimmer’s itch, eye and ear infections, and gastrointestinal problems.

 

However, most of the known swimming holes on the Souhegan tested OK; the only one not meeting the requirement was the Amherst Canoeport on Boston Post Road. The count here was 210. The Horseshoe in Wilton, Indian Ledges, Turkey Hill, and Watson Park all had acceptable levels for swimming.

 

About thirty Souhegan Watershed Association volunteers collect water samples every two weeks and deliver them to the wastewater treatment plants in Manchester, Greenville, Milford, Merrimack, and Nashua where certified labs process the samples. SWA has been collecting this data for the last 20 years and most of it is available on www.souheganriver.org.

 

The last scheduled test for this season will be on September 8. The results will be available on the website the following day. The bacteria tests take 24 hours to grow and read the bacteria colonies.

 

Anyone interested in volunteering for next year’s program can contact Karen at swawatertesting@gmail.com.

 

Here are this week’s results. The lower the number the cleaner the river; lower than 88 is excellent.

 

 E-COLI MONITORING RESULTS FOR TESTS TAKEN ON AUGUST 25, 2015

 

SOUHEGAN RIVER SITES:

 

  1. Billy Ward Pond, Ashburnham  #1  2.0,  #2  1.0

  2. SoR  333  Water Loom Pond, New Ipswich  6.3

  3. SoR  320  Highbridge, New Ipswich  70.3

  4. SoR  309  Above Greenville Mill Pond, Greenville  151.5

  5. SoR  296  Downtown Greenville upstream of WWTP  76.7

  6. SoR  291  Green Bridge off Rte 31 below Greenville WWTP   127.4

  7. SoR  218  Below the Horseshoe, Wilton   71.2

  8. SoR  210  Downtown Wilton  NA

  9. SoR  201  Pine Valley Mill, West Milford   NA

  10. SoR  170  Behind Hayward Field, West Milford  NA 

  11. SoR  155  Souhegan Valley Boys and Girls Club, Milford  613.1

  12. SoR  146  Swing Bridge, Milford  272.3

  13. SoR  133  Riverside Cemetery, Milford   127.4

  14. SoR  130  Behind Lorden Plaza, Milford   NA

  15. SoR  122  Amherst Country Club  235.9

  16. SoR  116  Amherst Conservation land Fairway Road, Amherst   NA

  17. SoR  095  Boston Post Road Canoeport, Amherst  209.8

  18. Sor   070   Seaverns Bridge, Merrimack  290.9

  19. SoR  057  Indian Ledges, Merrimack  122.3

  20. SoR  034  Turkey Hill Bridge, Merrimack   77.6 

  21. SoR  001   Watson Park, DW Hwy, Merrimack  32.3

 

 

MERRIMACK RIVER SITES:

 

1.      Mer  600  Above Amoskeag Dam, Manchester  10.8

2.      Mer  590  Arms Park, Manchester  52.0

3.      Mer  570  Goffs Falls, Litchfield  60.9

4.      Mer  560  Depot Street, Merrimack   NA

5.      Mer  550  Upstream of Souhegan River, Merrimack   31.3

6.      Mer  540  Thorntons Ferry, Merrimack  24.6

7.      Mer  530  Greeley Park, Nashua  19.9

8.      Mer  520  Taylors Falls Bridge, Nashua   13.4

9.      Mer  510  Sagamore Bridge, Hudson  17.1

10.  Mer  500  Pheasant Lane Mall, Hudson   NA

11.  Mer  490  Upstream of Tyngsboro Bridge  NA

 

                                   

Flow on Upper Souhegan was 23 CFS and expected flow for that date is 37

Flow on Lower Souhegan was 38 CFS and historic flow for that date is 41

Flow on Merrimack was 1300 CFS and historic flow for that date is 1330

RAINFALL -  Showers Sunday-Monday

Temperatures: Souhegan 22C;  Merrimack 23C

 

DISSOLVED OXYGEN RESULTS FOR TESTS TAKEN ON AUGUST 25, 2015

 

SOUHEGAN RIVER SITES:

 

  1. Billy Ward Pond, Ashburnham  #1  7.32, #2  7.63

  2. SoR  333  River Road above Water Loom Pond, New Ipswich  7.19

  3. SoR  320  Highbridge, New Ipswich  7.90

  4. SoR  309  Above Greenville Mill Pond, Greenville  7.66

  5. SoR  296  Downtown Greenville upstream of WWTP  8.09

  6. SoR  291  Green Bridge off Rte 31 below Greenville WWTP   8.09

  7. SoR  218  Below the Horseshoe, Wilton   8.62

  8. SoR  210  Downtown Wilton  NA

  9. SoR  201  Pine Valley Mill, West Milford   NA

  10. SoR  170  Behind Hayward Field, West Milford   NA

  11. SoR  155  Souhegan Valley Boys and Girls Club, Milford  7.08

  12. SoR  146  Swing Bridge, Milford  7.87

  13. SoR  133  Riverside Cemetery, Milford    7.64

  14. SoR  130  Behind Lorden Plaza, Milford  NA

  15. SoR  122  Amherst Country Club  7.25

  16. SoR  116  Amherst Conservation land Fairway Road, Amherst   NA

  17. SoR  095  Boston Post Road Canoeport, Amherst   6.97

  18. Sor   070   Seaverns Bridge, Merrimack  6.86

  19. SoR  057  Indian Ledges, Merrimack  8.00

  20. SoR  034  Turkey Hill Bridge, Merrimack   6.83   

  21. SoR  001   Watson Park, DW Hwy, Merrimack  8.59

 

 

MERRIMACK RIVER SITES:

 

12.  Mer  600  Above Amoskeag Dam, Manchester  7.68

13.  Mer  590  Arms Park, Manchester  7.85

14.  Mer  570  Goffs Falls, Litchfield  7.49

15.  Mer  560  Depot Street, Merrimack   NA

16.  Mer  550  Upstream of Souhegan River, Merrimack   8.14

17.  Mer  540  Thorntons Ferry, Merrimack  7.60

18.  Mer  530  Greeley Park, Nashua  8.32

19.  Mer  520  Taylors Falls Bridge, Nashua   8.47

20.  Mer  510  Sagamore Bridge, Hudson  8.71

21.  Mer  500  Pheasant Lane Mall, Hudson   NA

22.  Mer  490  Upstream of Tyngsboro Bridge  NA