John Martin Reservoir At Caddoa Reservoir
As of July 16, 2026, John Martin Reservoir At Caddoa is holding 26,654 acre-ft of water — 21% of normal storage for this date. Storage data refreshed throughout the day.
John Martin Reservoir At Caddoa
John Martin Reservoir is a man-made body of water located in southeastern Colorado, near the town of Caddoa. Named after John Martin, a former governor of Kansas, the reservoir was created in the 1940s as part of a federal project to conserve water for agriculture and municipal use.
The reservoir receives water from the Arkansas River, the Purgatoire River, and the Huerfano River, as well as from local snowpack. It is managed by the US Army Corps of Engineers, which monitors water levels and controls the release of water downstream.
In addition to providing water for irrigation, the reservoir is a popular destination for boating, fishing, and camping. The surrounding area is also home to a variety of wildlife, including bald eagles and mule deer.
Daily levels at John Martin Reservoir At Caddoa
Storage volume, pool elevation, and total release plotted from the operating agency's daily observations.
Storage
acre-ft · code 17
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around John Martin Reservoir At Caddoa -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Arkansas River Below John Martin Reservoir | 25 cfs | → |
| Purgatoire River Near Las Animas | 2 cfs | → |
| Arkansas River At Las Animas | 22 cfs | → |
| Arkansas River At Lamar | 8 cfs | → |
| Big Sandy Creek Near Lamar | 41 cfs | → |
| Arkansas River At La Junta | 20 cfs | → |
About John Martin Reservoir At Caddoa
Where does the data for John Martin Reservoir At Caddoa come from?
Daily storage, pool elevation, and release rates are sourced from USGS, USBR, and USACE monitoring stations. Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
Storage observations are updated daily by the operating agency. The 15-day weather forecast refreshes throughout the day. Snoflo caches and renders the most recent observation -- check the "as of" timestamp on the storage card.
What does the Hazard hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card below for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this reservoir, set a threshold, and you'll get a push the moment conditions cross.