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West Branch
Mohock Branch
West Branch; Mohock Branch
	West Branch flowing under the Hamden Covered Bridge
	Map of the upper Delaware River watershed, showing major tributaries
Location
Country	United States
State	New York
Region	Catskills
Counties	Schoharie, Delaware
Towns	Stamford, Delhi, Hancock, Deposit
Physical characteristics
Source	Unnamed pond
• location	North of Mount Jefferson
• coordinates	42°27′16″N 74°36′01″W / 42.45444°N 74.60028°W
Mouth	Delaware River
• location	Hancock
• coordinates	41°56′20″N 75°16′45″W / 41.9389755°N 75.2790615°W
• elevation	883 ft (269 m)
Length	90 mi (140 km)
Basin size	666 sq mi (1,720 km2)
Discharge
• location	Walton
• average	469 cu ft (13.3 m3)
• minimum	12 cu ft (0.34 m3)
• maximum	28,600 cu ft (810 m3)
Discharge
• location	Hale Eddy
• average	780 cu ft (22 m3)
• minimum	17 cu ft (0.48 m3)
• maximum	43,400 cu ft (1,230 m3)
Basin features
River system	Delaware River
Tributaries
• left	Little Delaware River
• right	West Brook, Oquaga Creek

The West Branch Delaware River is one of two branches that form the Delaware River. It is approximately 90 mi (144 km) long, and flows through the U.S. states of New York and Pennsylvania. It winds through a mountainous area of New York in the western Catskill Mountains for most of its course, before joining the East Branch along the northeast border of Pennsylvania with New York.^[2] Midway or so it is empounded by the Cannonsville Dam to form the Cannonsville Reservoir, both part of the New York City water supply system for delivering drinking water to the City.^[3]^[4]

Course

It rises in Schoharie County, New York and flows generally southwest, entering Delaware County and flowing past Stamford and Delhi. In southwestern Delaware County it flows in an increasingly winding course through the mountains, generally southwest. At Stilesville it is impounded to form the Cannonsville Reservoir. At Deposit, on the border between Broome and Delaware counties, it turns sharply to the southeast and is paralleled by New York State Route 17. It joins the East Branch at Hancock to form the Delaware. For the lower 6 mi (10 km) it forms part of the boundary between New York and Pennsylvania.

Hydrology

The United States Geological Survey (USGS) maintains many stream gauges along the West Branch Delaware River.

The station by the Village of Delhi, in operation since 1937, but making daily measurements since November 1996, is located .6 miles (0.97 km) upstream from the bridge on Route 28, and 1.9 miles (3.1 km) upstream from the confluence of the Little Delaware River.^[5] This station had a maximum discharge of about 13,000 cubic feet per second (370 m³/s) and a gauge height of 9.8 feet (3.0 m) from floodmark on January 19, 1996 and a maximum gage height of 12.53 feet (3.82 m) on August 28, 2011 as Hurricane Irene passed through the area. It had minimum discharge of 2.6 cubic feet per second (0.074 m³/s) on September 25, 1964 and a minimum gauge height of 1.72 feet (0.52 m) on September 16–17, 2016.^[5]

The Hobart station, in service since 2000, located 300 feet (91 m) upstream from Maple Street in the Hamlet of Hobart. This station had a maximum discharge of about 995 cubic feet per second (28.2 m³/s) and a gauge height of 3.22 feet (0.98 m) on August 28, 2011 caused by Hurricane Irene. It had minimum discharge of .05 cubic feet per second (0.0014 m³/s) on November 13, 2001 and November 19, 2001.^[6]

The Walton station, in service since 1950, located 100 feet (30 m) downstream from West Brook in the Village of Walton. This station had a maximum discharge of about 28,600 cubic feet per second (810 m³/s) and a gauge height of 16.85 feet (5.14 m) on June 28, 2006 during the 2006 Mid-Atlantic United States flood. It had minimum discharge of 12 cubic feet per second (0.34 m³/s) on September 15 and November 22, 1964.^[7]

The Hale Eddy station, in service since 1912, located 9 miles (14 km) upstream from the confluence of East and West Branches. Since the construction of the Cannonsville Reseevoir this station had a maximum discharge of 43,400 cubic feet per second (1,230 m³/s) and a gauge height of 19.1 feet (5.8 m) on June 28, 2006 during the 2006 Mid-Atlantic United States flood. It had minimum discharge of 17 cubic feet per second (0.48 m³/s) on October 20, 1963. The maximum discharge, prior to construction of Cannonsville Reservoir in 1963, was 28,900 cubic feet per second (820 m³/s) on March 22, 1948. Outside the period of record: In the flood of October 10, 1903 this station reached a discharge of roughly 46,000 cubic feet per second (1,300 m³/s)^[8]

Fishing

The West Branch is tailwater fishery. This means the same cold water releases that keep it cooler in the summer, keep the river a little warmer in the winter and early spring. The upper section can be cleaner than other rivers during periods of heavy runoff. During high water on the Cannonsville Reservoir, many bait fish spill over the dam. These factors all provide and excellent environment for trout to thrive in.^[9]

The trout population in this river is naturally reproducing, during the warm months stocked trout from smaller and warmer tributaries will seek sanctuary in its cool water. The West Branch Delaware River was divided into two sections when the Cannonsville Reservoir was formed. Downstream of the Cannonsville Reservoir, there are large numbered wild populations of brown trout and rainbow trout and an occasional brook trout can be caught although none are stocked. Seasonal anadromous runs of american shad with reports of occasional striped bass.^[10] This section is considered one of the best fly fishing trout streams in the United States, due to the cold water released from the reservoir.^[11]