[Code of Federal Regulations]
[Title 33, Volume 3]
[Revised as of July 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 33CFR207.425]

[Page 73-74]
 
                TITLE 33--NAVIGATION AND NAVIGABLE WATERS
 
 CHAPTER II--CORPS OF ENGINEERS, DEPARTMENT OF THE ARMY, DEPARTMENT OF 
                                 DEFENSE
 
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

[[Page 74]]

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

[40 FR 57358, Dec. 9, 1975]