As used in this chapter, unless the context clearly requires a different meaning:

1. (a) “California Exposition flood plain” means that portion of state-owned California Exposition land in the American River flood plain as it exists on January 1, 1977.
2. (b) “Bushy Lake area” means that portion of the California Exposition flood plain bounded by the continuous line enclosing Bushy Lake, which line is 100 feet outside the 25-foot elevation contour line as limited on the north side by the waterside toe of the levee and as limited on the west side by a line 100 feet east of State Highway Route 80 as it exists on January 1, 1977.
3. (c) “Bushy Lake” means a body of water in the Bushy Lake area with approximately 11 acres of water surface in the summer and approximately 80 acres in the winter.
4. (d) “Lower American River” means that portion of the American River between Nimbus Dam and the confluence of the American River with the Sacramento River.