Plot last updated at : 01:12 hrs - Thu, 12 Mar 2026

                       SUMNER DAM AND LAKE SUMNER
                               PECOS RIVER
                         DRAINAGE AREA = 3,917 SQ MI
            (1,483 sq. mi. BETWEEN SANTA ROSA DAM AND SUMNER DAM)

                      VOLUME       AREA      ELEV.        FLOW IN CFS   
                  IN ACRE-FEET   IN ACRES  IN FEET   OUTLET     SPILLWAYS
                                           (NAVD88)         SERVICE EMERGENCY 

TOP OF DAM (1)       260,263      8,219   4,302.88    1,870  60,000  188,000

MAXIMUM POOL         216,508      6,843   4,298.88    1,840  56,000  150,000

EMERGENCY SPILLWAY   140,786      5,724   4,286.88    1,775  43,700   45,000
FUSE PLUG 4 CREST (2)

EMERGENCY SPILLWAY   135,118      5,612   4,285.88    1,770  42,500   37,000
FUSE PLUG 3 CREST (2)

EMERGENCY SPILLWAY   129,562      5,500   4,284.88    1,765  41,000   32,000
FUSE PLUG 2 CREST (2)

EMERGENCY SPILLWAY   124,119      5,382   4,283.88    1,760  39,500   25,000
FUSE PLUG 1 CREST (2)

EMERGENCY SPILLWAY    90,212      4,354   4,276.88    1,700  28,000        0
INVERT & TOP OF CLOSED
SERVICE SPILLWAY GATES (3)

TOP OF WINTER JOINT   61,062      3,436   4,269.40    1,650   11,000       0
USE/BOTTOM OF FLOOD SPACE
(01NOV TO 30APR)

TOP OF SUMMER JOINT   41,062      2,703   4,262.88    1,610   1,400        0
USE/BOTTOM OF FLOOD SPACE
(01MAY TO 31OCT)

SERVICE SPILLWAY &    35,917      2,444   4,260.88    1,600       0        0
TOP OF ACTIVE CONSERVATION (4)

TOP OF INACTIVE        2,500        335   4,232.28    1,200       0        0

CONDUIT INVERT AND         0          0   4,201.88        0       0        0
TOP OF DEAD POOL

COMMENTS
U.S. BUREAU OF RECLAMATION PROJECT
AUTHORIZED SPACE
FLOOD CONTROL         53,000
MIN. CONSERVATION     20,000 (PLUS 20,000 WINTER STORAGE, 1NOV THRU 30APR)
SEDIMENT              64,000

1 INCH OF RUNOFF EQUALS 79,093 AC-FT
EAC TABLE ADOPTED AUGUST 2014

(1) 2014 TABLE EXTENDS TO 4,299.00 NAVD88. TOP OF DAM DATA FROM 1989 EAC 
    TABLE.
(2) FLOWS BASED ON ALL FUSE PLUGS BEING WASHED AWAY (SILL ELEVATION 4,276.88.
    LESSER FLOWS WILL OCCUR BEFORE PLUGS WASH OUT.
(3) RADIAL GATES ON SERVICE SPILLWAY OPEN AUTOMATICALLY ABOVE 4,276.88 AND
    ARE FULL OPEN (13 FEET) BY 4,277.38.
(4) MAX CONSERVATION POOL STORAGE LOWERED TO ELEVATION 4,260.88 EFFECTIVE JUNE 
    2012 IN ORDER TO KEEP WATER OFF OF SPILLWAY GATES TO REDUCE MAINTENANCE.

ALL ELEVATIONS IN NAVD88. SUBTRACT 1.88 FEET TO CONVERT NAVD88 ELEVATIONS TO 
PROJECT DATUM. SUBTRACT 2.11 FEET TO CONVERT FROM NAVD88 TO NGVD29.

Channel Capacities:
Santa Rosa Dam to Lake Sumner: 13,000 cfs (Puerto de Luna Gage)
Sumner Dam to Brantley Reservoir: 8,500 cfs
Brantley Dam to Red Bluff Reservoir: 20,000 cfs
Changes in release rates during Flood Control Ops below 4,276.88 will be limited to 
1,000 cfs per half hour.

Travel Times:
Santa Rosa to Lake Sumner, 11 hrs
Sumner Dam to Acme Gage, 48 hrs (2 days)
Sumner Dam to Artesia Gage, 72 hrs (3 days)