Update on Cannonsville Reservoir water release

Late yesterday (October 4) many UDR watershed stakeholders received a press release from NYCDEP announcing temporary adjustments over the next 3 days to the Cannonsville reservoir release to repair a leaky pipe in the release chamber and to fix the USGS Stilesville (NY) gage. 

See update below from NYC for adjusted release levels. 

The decision on the timing of this necessary action was intended to avoid brown trout spawning activities and coincide with recent and anticipated precipitation.

NYCDEP recognized that the 11th hour public notification was insufficient and understands the need for improved advanced warning in the future when events like this one occur.  NYC also agreed to compensatory releases from Pepacton Reservoir to the East Branch and Main Stem during the 3-day work period. 

We remain concerned about the impacts of low (and no) releases to aquatic habitat on the West Branch. We will have volunteers monitoring the system tomorrow and Wednesday. According to the NYSDEC, “macroinvertebrates may experience some dewatering impacts but on average should stay moist and cool until the water returns”.

Thanks to the dozens of UDR anglers and conservation interests who weighed in with the regulatory agencies beginning last night through this morning. It’s another example of the benefit and need for those closest to the resource to keep a watchful eye out for the river.


After consulting with several downstream stakeholders, DEP will make some changes to our reduced releases that were announced last night.

To make up for reduced flows coming out of Cannonsville Reservoir, DEP will increase the release from Pepacton Reservoir to at least 400 cubic feet per second for the next several days. The increase at Pepacton is more than the reduction at Cannonsville, which will support overall flows on the main stem of the Delaware River.

This is the updated schedule:

Cannonsville – 40 cfs in the morning; 150 cfs in the afternoon
Pepacton – ramping up to at least 400 cfs

Cannonsville – Zero flow from 5 a.m. – 5 p.m., then back to 40 cfs
Pepacton – At least 400 cfs

Cannonsville – 40 cfs until 9 a.m., then back up to at least 150 cfs
Pepacton – At least 400 cfs until Cannonsville work is complete

These flow changes are necessary for the U.S. Geological Survey to calibrate its gage in Stilesville, and for DEP to fix a leaking pipe in the release chamber at Cannonsville.

Read NYCDEP Announcement Here

For the River,
Jeff Skelding, Executive Director
[email protected]

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