| River Reservoir | |
| Location: | Apache County, Arizona, United States |
| Type: | Reservoir |
| Pushpin Map: | Arizona |
| Basin Countries: | United States |
| Area: | 50acres |
| Depth: | 20feet |
| Elevation: | 8220feet |
Built in 1896 on the Little Colorado River, River Reservoir is the largest and deepest of a trio of lakes collectively known as the Greer Lakes. Drained since 2004 because of safety issues, the dam at River Reservoir was repaired in 2005. Like the other two Greer Lakes, it has new amenities. River Reservoir is located at 8220feet on the Apache-Sitgreaves National Forests.
River Reservoir has 50acres with a maximum depth of 45feet and an average depth of 20feet. The Arizona Game and Fish Department stocks River Reservoir with fingerling rainbow trout in the spring and catchable-sized rainbow trout in the spring and summer. Like its two neighboring reservoirs, River gets a few brown trout from the LCR diversion that refills it in the winter, but browns are not stocked here.