[Code of Federal Regulations]
[Title 33, Volume 3]
[Revised as of July 1, 2001]
From the U.S. Government Printing Office via GPO Access
[CITE: 33CFR207.425]

[Page 64-65]
 
                TITLE 33--NAVIGATION AND NAVIGABLE WATERS
 
         CHAPTER II--CORPS OF ENGINEERS, DEPARTMENT OF THE ARMY
 
PART 207--NAVIGATION REGULATIONS--Table of Contents
 
Sec. 207.425  Calumet River, Ill.; Thomas J. O'Brien Lock and Controlling Works and the use, administration and navigation of the lock.

    (a) Controlling Works. (1) The controlling works shall be so 
operated that the water level at the downstream end of the lock will be 
maintained at a level lower than that of Lake Michigan, except in times 
of excessive storm run-off into the Illinois Waterway, or when the lake 
level is below minus 2 feet, Chicago City Datum.
    (2) The elevation to be maintained at the downstream end of the lock 
shall at no time be higher than minus 0.5 feet, Chicago City Datum, and 
at no time lower than minus 2.0 feet, Chicago City Datum, except as 
noted in paragraph (a)(1) of this section.
    (b) Lock--(1) Operation. The Thomas J. O'Brien Lock and Dam is part 
of the Illinois Waterway which is a tributary of the Mississippi River. 
All rules and regulations defined in Sec. 207.300, Ohio River, 
Mississippi River above Cairo,

[[Page 65]]

Illinois, and their tributaries; use, administration and navigation 
shall apply.

[40 FR 57358, Dec. 9, 1975]