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This chart by the U.s. Geological Survey shows the flow in the Souhegan River's mouth (blue line) as compared to the 77-year historic average for each day (small triangles). The river's flow was at 1 percent of historic average less than a month ago.
Friday, May 4, 2012

All this rain has brought rivers back to normal (finally!)

You might be getting a little tired of clouds and rain this week, but our creeks and rivers aren’t: The winter was so dry that they’re hardly back to normal.

Several automated streamflow gauges in Greater Nashua were recording flows at 1 percent of the historic average for this time of year as recently as three weeks ago.

As of Wednesday, the U.S. Geological Survey gauge at the mouth of the Souhegan River in Merrimack had made it back to average flow for this time of year. It’s slightly above average on Friday.

Similarly, the Merrimack River gauge in Goffstown and the Nashua River gauge in Pepperell, Mass., made it back to seasonal average this week.