John Martin Reservoir water level today
Storage at John Martin Reservoir in the Arkansas basin (Division 2), from Colorado DWR's daily reading.
About John Martin Reservoir
John Martin Reservoir is one of the 4 reservoirs BasinMind follows in the Arkansas basin, Division 2 of Colorado's seven water divisions. BasinMind's registry lists its operator as US Army Corps of Engineers. Its recorded capacity is 346,000 acre-feet (conservation pool; flood pool excluded), the second-largest of the 4 and 36% of the capacity BasinMind tracks in the division.
On October 3, 2026 it held 26,733 acre-feet, 8% of that capacity, with room for about 319,267 acre-feet more. Over the seven days before, storage rose by 6,350 acre-feet. Taken together, the division's reservoirs with a current reading stood at 36% of capacity (353,492 of 974,018 acre-feet).
Daily storage comes from the Colorado Division of Water Resources, DWR station JMRCADCO; the official record is on that station's page. The nearest stream gauge BasinMind reads is Arkansas River below John Martin Reservoir, about 1 miles away in a straight line.
An acre-foot is the water that would cover one acre a foot deep, about 325,851 gallons; percent full compares storage with recorded capacity, not with what is normal for the date (cfs and acre-feet).
Other reservoirs in the Arkansas basin
- Pueblo Reservoir · 44% full
- Twin Lakes · 71% full
- Turquoise Lake · 54% full
Stream gauges in the Arkansas basin
- Arkansas River at Parkdale
- Arkansas River near Leadville
- East Fork Arkansas River at US Highway 24 near Leadville
- Arkansas River near Nathrop
- Arkansas River at Portland
- Arkansas River at Moffat Street at Pueblo
- Arkansas River near Avondale
- Arkansas River at La Junta