California Code, Public Resources Code - PRC § 5074.3

(a) The right of eminent domain may not be exercised to acquire property, any interest in property, or use of any property for the trails contemplated pursuant to this article.

(b) Notwithstanding the provisions of subdivision (a) of this section, the director may, pursuant to Section 5006, replace property or interests in property through the exercise of eminent domain whenever a trail, or a portion thereof, has been acquired through the exercise of eminent domain by another public entity; provided, that the property to be acquired is in the immediate vicinity of the property being replaced, and the director may, pursuant to Section 5006, acquire property or interests in property through the exercise of eminent domain for trails established pursuant to this article in hardship cases as determined by the department. Acquisitions pursuant to this section shall be funded by moneys appropriated as provided in Section 5075.