Gauge Description:

Note: USGS added a new gage on the Souhegan in the summer of 2008 about 2 miles downstream of the takeout in Milford.  This new gage a much better indicator of levels on the upper Souhegan than the Merrimack gage.  We will need to gather more information over time to correlate the gage to runable levels, however the 400 cfs level should be fairly accurate. It is a good indicator of how high the level might of been about 18
hours prior. The painted gage on the Upper Souhegan about 5 miles upstream is what is commonly used. If the upper section is running the lower will be also. Usually it can be run at a slightly lower level than the upper section can be run at.
 

Estimated chance (%) of finding the river runnable.
Month............% chance.................comment
 

January ............ 5%....Usually frozen
February............10%....Usually frozen.
March...............40%....Opens up about mid month.
April...............70%....Best chance in early April 
May ................30%....Best chance in early May. 
June................10%
July.................5%
August...............5%....Just a trickle 
September...........15%....Tropical storms and their remains
October........�....20%
November............40%....Fall rains, dormant trees 
December............35%....River starts freezing about Christmas.

Be aware this is averaged out over several years. The % chance refers to the probability of finding the river running on any given day. For instance a 5% probability for August means on average you can only expect 1-1/2 days of water. One year there could be 3 days in August with water, other years none. Spring levels are usually higher than fall levels. The river rises and falls rapidly because of the small steep watershed. An occasional summer storm could bring the river up for a day.
 

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