followed through on reducing the amount of wastewater discharge, but only a few have completely stopped, with many companies citing cost as a prime factor for continued pollution. On April 15, 2020, a large explosion occurred at the Verso Paper Mill, located on the river. It is unknown what impacts, either negative or positive, the explosion and the mill's indefinite closing will have on water quality. Streamflow The U.S. Geological Survey (USGS) maintains four river flow gauges on the Androscoggin River. All four are below one or more dams. The first is at Errol, New Hampshire (), where the watershed is . Flow here has ranged from 16,500 to 0 ft³/s (467 and 0 m³/s) (zero flow when dam closed). The mean annual flow between 1905 and 2005 is 1,919 ft³/s (54.3 m³/s). The second is near Gorham, New Hampshire (), where the watershed is . Flow here has ranged from 21,900 to a mean daily low of 795 ft³/s (620 and 22.5 m³/s) (lows when dam closed). The mean annual flow between 1905 and 2005 is 2,512 ft³/s (71 m³/s). The third is at Rumford, Maine (), where the watershed is . Flow here has ranged from 74,000 to 625 ft³/s (2,094 and 17.7 m³/s). The mean annual flow between 1905 and 2005 is 3,801 ft³/s (107.6 m³/s). The fourth is at Auburn, Maine (), where the watershed is . Flow here has ranged from 135,000 to 340 ft³/s (3,820.5 and 9.6 m³/s). Recreation Angling The Androscoggin River is a popular fishing destination for anglers. The upper section of the river offers good fly fishing for brook, rainbow and brown trout. Landlocked salmon can also be caught in the far northern portions of the river near Errol, New Hampshire. As the river progresses south and east of the White Mountains, the river widens some and the water quality becomes more acidic. As a result of these changes, the trout and salmon fisheries vanish almost entirely in the central and lower portions of the river. However, these sections often contain trophy smallmouth bass fisheries. Northern pike also inhabit the lower sections, with quality specimens being reported for this species as well. Other species found in the lower portions include redbreast sunfish, yellow perch, and white suckers. Paddling The Androscoggin River Watershed Council, a local nonprofit, has been working to establish a water trail along the entire length of the river.