Warning! This data has NOT been reviewed for accuracy.

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Time series plot showing recent conditions at the lake or reservoir. See tabulated data for details.

Plot last updated at : 11:11 hrs - Fri, 15 May 2026

 

                              JOHN MARTIN RESERVOIR
                                  ARKANSAS RIVER
                           DRAINAGE AREA = 18,130 SQ MI


                         VOLUME         AREA       ELEV.      FLOW IN CFS
                         IN ACRE-FEET   IN ACRES   IN FEET    OUTLET  SPILLWAY


TOP OF DAM               825,000        23,598     3,880              660,000

 

TOP OF FLOOD CONTROL     616,559        18,070     3,870      16,300  639,000



MAX. REC. AND            348,587        12,017     3,851.84   
CONSERVATION



TOP OF CONSERVATION      338,587        11,820     3,851      14,700  128,000



SPILLWAY CREST           224,540         8,759     3,840      13,780        0





ZERO STORAGE                   0             0     3,770           0        0


CONDUIT INVERT                 0             0     3,766           0        0


STREAM BED                                         3,765


COMMENTS

VERTICAL DATUM NGVD29
ADD 1.80 FEET TO CONVERT ELEVATIONS TO NAVD88
MAXIMUM PERMANENT POOL CAPACITY = 15,000 ACFT (10,000 ACFT OF PERMANENT POOL 
   MAY EXTEND INTO FLOOD POOL.)
1 INCH OF RUNOFF EQUALS 966,933 AC-FT
FLOOD CONTROL SPACE EQUALS 0.29 INCHES OF RUNOFF
A-C TABLE ADOPTED NOVEMBER 2019
TOTAL SEDIMENT DEPOSITION TO DATE 85,216 ACRE-FEET (2017 SURVEY+METHOD CHANGE)