Rocky Arroyo (Upper Pecos-Black)
Streamflow, conditions and background by watershed segment. Data through November 1, 2026.
Where it is
Segments are the HUC8 watersheds the gauges sit in, numbered upstream to downstream. Use the buttons to switch between the state and the river.
- 1Upper Pecos-Black
- river and reservoirs
- gauge
About the Rocky Arroyo (Upper Pecos-Black)
This report follows 33 miles (53 km) of the Rocky Arroyo (Upper Pecos-Black), all within the Upper Pecos-Black watershed segment. At the lower end of the report the river drains about 294 square miles. Downstream of the mapped reach it flows into the Pecos River. Named tributaries joining it here include the Indian Creek and North Rocky Arroyo. 1 gauge with at least 26 weeks of daily flow cover 1940 to 2026.
From the archive: NHDPlus river network, WBD watersheds, NHD waterbodies, TIGER urban areas and the report's gauges.
From the headwaters down
Each watershed segment in order, with last week's flow rated against the same week in 1991–2020.
Segment 1: Upper Pecos-Black
0 cfs last week normal.
Median conductance 365 µS/cm in the 2000s. Rain over the last 3 months: 127% of normal.
Reservoirs
| Reservoir | Completed | Main purpose | Storage, acre-ft |
|---|---|---|---|
| Two Rivers Reservoir (Rocky Dam)Rocky Dam, Two Rivers project | flood control (normally dry) |
From the archive: National Inventory of Dams (USACE) and the reservoir registry.
Water users
Surface water withdrawn, 2020
In the counties this river crosses (Eddy): 90,794 acre-feet. County totals include other streams.
| Use | Share (bar) | Share | Acre-ft |
|---|---|---|---|
| Irrigated agriculture | 77% | 69,614 | |
| Reservoir evaporation | 23% | 21,131 | |
| Livestock | 0% | 49 |
State Engineer, New Mexico Water Use by Categories 2020.
Sources
Numbered sources for the statements above, as they were read when the page was prepared.