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1 Elevations of pools for Dams Nos. 24, 25, and 26 referred to M. S. L., 1929 adjustment; all others referred to M. S. L., 1912 adjustment.

2 Except as otherwise noted, all lifts are based upon proposed level pool stages above and below locks.

3 Information concerning status of construction is as of Dec. 31, 1946.

4 Top of flash boards, normal pool. Masonry crest elevation 723.1.

5 Ultimate.

6 Present pool. Ultimate pool elevation 563.25.

7 Depth over upper poiree sill.

8 Lift above possible future pool. Lift at extreme low water about 28.2 feet.

[graphic]

LOCK & DAM NO. 26 ALTON, ILLINOIS

(202.9 MILES ABOVE OHIO RIVER)

100 0

SCALE OF FEET 1000

All elevations refer to Mean Sea Level Datum

(1929 Adjustment)

2000

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