La. Stat. tit. 38 § 3087.142
The Castor Creek Reservoir District is created out of the watershed of that portion of Castor Creek located within the boundaries of the parishes of Caldwell, Winn, and LaSalle, more particularly defined as follows:
That area commencing at a point on the LaSalle Parish- Caldwell Parish line where it intersects with highway U.S. 165, thence generally northeasterly paralleling highway U.S. 165 to a point where it intersects with highway LA 126, thence generally westerly paralleling LA 126 to a point where it intersects with highway LA 499, thence generally southwesterly paralleling highway LA 499 to a point where it intersects highway LA 34, thence generally southerly paralleling highway LA 34 to a point where it intersects highway U.S. 84, thence generally southeasterly paralleling highway U.S. 84 to a point where it intersects highway U.S. 165, thence generally northeasterly paralleling highway U.S. 165 to a point where it intersects the LaSalle Parish-Caldwell Parish line, being the point of commencement.
La. R.S. § 38:3087.142