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USGS Water-Year Summary 2024
08390610 TWO RIVERS RESERVOIR (RIO HONDO RESERVOIR) NEAR ROSWELL, NM
LOCATION - Lat 33°17'58.46", long 104°43'31.84" referenced to North American Datum of 1983, Chaves County, NM, Hydrologic Unit 13060008, near center of Diamond A Dam on Rio Hondo, 13 mi southwest of Roswell at mile 33.4.
DRAINAGE AREA - 963 mi². 
SURFACE-WATER RECORDS
PERIOD OF RECORD - July 1963 to September 1965 (monthend storage), October 1965 to December 2017 (daily observations of storage), September 2017 to current year (gage height).
GAGE - Water-stage recorder with satellite telemetry. Elevation of gage is NGVD of 1929 (levels by U.S. Army Corps of Engineers).
Manuscript still just says Elevation of gage is NGVD29, but it should include an additive factor to bring gage height to NGVD29 (or NAVD88). Factor for converting gage height to elevation should be obtained from COE and verified by running a GNSS solution at the site.
COOPERATION - Storage records were provided by U.S. Army Corps of Engineers.
REMARKS - Two Rivers Reservoir, completed July 16, 1963, is formed by earthfill dams on Rio Hondo, which forms Rio Hondo Reservoir, and on Rocky Arroyo, which forms Rocky Arroyo Reservoir. Above elevation 3,980.0 ft, the pools of the two reservoirs combine to form Two Rivers Reservoir with a total capacity of 163,800 acre-ft, at elevation 4,032.0 ft, crest of ungated spillway. Capacity by original survey was 167,900 acre-ft. Capacity of Rio Hondo Reservoir, 142 acre-ft, from capacity table dated Jan. 1990, between elevations 3,957.0 ft, sill of outlet gate, and 3,980.0 ft. Capacity of Rocky Arroyo Reservoir, 12,860 acre-ft, from capacity table dated January 1990, between elevations 3,945.0 ft, sill of outlet gate, and 3,980.0 ft. No dead storage in Rio Hondo Reservoir or Rocky Arroyo Reservoir. Primary objective of project is flood control. Outlet conduits in Rocky Dam have fixed openings.
