Middle Fork Popo Agie River

Middle Fork Popo Agie River
The Middle Fork Popo Agie River seen from Main Street in Lander Wyoming.
The Flow of the Middle Fork Popo Agie from source to confluence.
Etymology	word po-PO-shuh, meaning "Head River"[1] or possibly "Gurgling River" [2]
Location
Country	United States
State	Wyoming
City	Lander, Wyoming
Physical characteristics
Source	Sweetwater Gap
• location	Wind River Range, Fremont County
• elevation	12,000 ft (3,700 m)
Mouth	North Popo Agie River
• location	Fort McGraw
• coordinates	42°51′14″N 108°42′00″W / 42.8540°N 108.6999°W / 42.8540; -108.6999
• elevation	5,000 ft (1,500 m)
Length	54 mi (87 km)
Basin features
Tributaries
• left	Baldwin Creek,[3] Beason Creek[3]
• right	Sawmill Creek,[3] Red Canyon Creek,[3]Roaring Fork Creek

The Middle Fork Popo Agie River is a river in Wyoming in the United States. The river is 54 miles (87 km)^[3] long. The river is sometimes referred to as simply the 'Middle Fork'. The river is part of the Popo Agie Watershed^[3] and from its headwaters in the Wind River Range until it joins with the North Fork of the Popo Agie River in the Wind River Basin, the river and its tributaries irrigate roughly 11,503 acres.^[3]

The river is notable for passing underground through a sinkhole in Sinks Canyon State Park, only to emerge several hundred yards downstream at "the rise." The ground distance is not far, but tests with dye have shown it takes the water many hours to flow through the underground passage.