
209 Mich. App. 452 (1995)
532 N.W.2d 192
TROUT UNLIMITED, MUSKEGON-WHITE RIVER CHAPTER
v.
CITY OF WHITE CLOUD
Docket No. 161437.
Michigan Court of Appeals.
Submitted August 2, 1994, at Grand Rapids.
Decided March 21, 1995, at 9:15 A.M.
McCroskey, Feldman, Cochrane & Brock, P.C. (by J. Walter Brock), for the plaintiffs.
Landman, Latimer, Clink & Robb (by David L. Bossenbroek), for the defendant.
Before: HOOD, P.J., and MARILYN KELLY and J.L. MARTLEW,[*] JJ.

AFTER REMAND
PER CURIAM.
Plaintiffs, Trout Unlimited, Muskegon-White River Chapter and Richard McEwen, appeal as of right from a judgment finding that they had no cause of action against the City of White Cloud. Plaintiffs had alleged violations of *454 the Michigan Environmental Protection Act (MEPA) stemming from defendant's reconstruction of a dam on the White River, following its destruction in a flood. MCL 691.1202; MSA 14.528(202). They had also alleged negligence, trespass, nuisance and enactment of improper legislation. 1988 PA 484. We affirm in part, and remand in part for further proceedings consistent with this opinion.
I
This case comes to us with a long factual and procedural history. The facts of the case are clearly set forth in Trout Unlimited, Muskegon-White River Chapter v White Cloud, 195 Mich App 343, 344-346; 489 NW2d 188 (1992). There, a panel of our Court concluded that plaintiffs had standing to pursue their claims and remanded to the trial court. Our Court instructed the trial court that, under the MEPA, the trial court must conduct a dual inquiry to determine
whether a natural resource is involved and whether the effect of the activity on the environment rises to the level of impairment to justify the court's intervention. [Id., p 349.]
Initially, the Court expressed no opinion regarding plaintiffs' claims or the nature of relief.
On remand, the parties agreed that the trial judge could decide the issues based on the evidence presented at the original trial. The judge issued his opinion some months later.
Answering the two-part inquiry in Trout Unlimited, the judge found that a natural resource was affected by the dam's reconstruction. Also, he held, plaintiffs failed to show that the reconstruction rose to a level of impairment which justified judicial intervention.
*455 The judge made the determination by applying the four-part test delineated in Kent Co Rd Comm v Hunting, 170 Mich App 222, 233; 428 NW2d 353 (1988). First, he concluded that trout were not rare, unique or endangered; only a small portion of the Middle White River had the potential to become a blue-ribbon trout stream in the absence of the reconstructed dam. Second, he concluded that the dam reconstruction project did not diminish the trout population as it existed after the flooding and dam failure. He found that the reconstructed dam would not obliterate trout fishing in the Middle White River. The judge believed the river could be maintained as a fair trout stream. Third, he found no evidence showing that the dam caused a negative impact on natural resources, other than the potential trout population. Fourth, he concluded that none of the proofs established that the dam reconstruction project caused the trout habitat to deteriorate from the condition that existed before the project.
In finding no cause of action for plaintiffs, the judge wrote:
In effect, the plaintiffs seek to have the City create a natural resource  namely, high quality, cold water fishing in the Middle White River, which has not existed for more than 100 years. The primary purpose of MEPA is to protect existing natural resources, not to create natural resources. Also, it is questionable that any portion of the Middle White River would become a blue-ribbon trout stream, even if the dam was not rebuilt.
The judge made no ruling on the validity of 1988 PA 484. Plaintiffs contended that the Act constituted improper local legislation, failed to protect a public trust and neglected to require a permit from the Natural Resources Commission as mandated *456 by MCL 281.761 et seq.; MSA 11.501 et seq. MCL 281.951 et seq.; MSA 11.475(1) et seq. The judge also made no ruling on plaintiffs' claims of negligence, trespass and nuisance (counts II, III and IV in the original complaint.)
On appeal, plaintiffs challenge the decision that they had no cause of action against White Cloud for alleged violations of the MEPA and violation of the public trust.
II
We review de novo actions involving MEPA violations. However, we will not overturn a trial court's findings of fact unless they are clearly erroneous or unless convinced that we would have reached a different result. Kent Co Rd Comm, supra, pp 232-233; Portage v Kalamazoo Co Rd Comm, 136 Mich App 276, 279; 355 NW2d 913 (1984). A finding is clearly erroneous when evidence exists to support it but our Court is left with a definite and firm conviction that the trial court made a mistake. Kent Co Rd Comm, supra, p 233.
We have reviewed the evidence underlying the trial court's factual conclusions on the four factors set forth in Kent Co Rd Comm. Based on the evidence, we decline to overturn the trial judge's findings of fact. We cannot conclude that they are clearly erroneous or that, sitting as factfinders, we would have reached a different result.
Plaintiffs argue that the trial court erred in concluding that the original dam was destroyed by an act of God rather than by defendant's negligent actions.
An act of God is a valid defense to a trespass claim and presents a question of fact for a factfinder. Smith v Chippewa Co Rd Comm'rs, 5 Mich App 370, 373; 146 NW2d 702 (1966). Here, the evidence indicates that heavy rains in the area endangered the dam and the surrounding region. *457 In response, the City intentionally breached the dam.
We will not set aside findings of fact unless they are clearly erroneous. MCR 2.613(C). The judge's findings that defendant breached the dam only because it was confronted with a disaster created by an act of God were supported by evidence and not clearly erroneous.
III
Plaintiffs also contend that the circuit court's opinion did not dispose of all the factual and legal issues they raised in their complaint. We agree that the trial court reviewed and resolved only those issues relating specifically to plaintiffs' MEPA claims pursuant to the order of our Court. Furthermore, finding that an act of God was responsible for defendant breaching the dam resolved plaintiffs' trespass claim.
We remand to the trial court for findings regarding plaintiffs' non-MEPA claims which it did not address in its opinion of January 14, 1993. These include the question of whether defendant had authority to rebuild the dam without certain approvals, the constitutionality of 1989 PA 300, MCL 281.1313(3); MSA 11.420(13)(3), and claims of negligence and nuisance.
We find that the stipulation of August 7, 1990, does not constitute a bar to consideration of the issues of negligence and nuisance. "Damages" as used in the stipulation refers to the correct relief, including monetary damages, which would accrue should plaintiffs prevail. We agree that both parties waived consideration of these issues until after a determination of liability had been made.
We affirm in part. We remand for further consideration of the unresolved issues in a manner *458 consistent with this opinion. We do not retain jurisdiction.
NOTES
[*]  Circuit judge, sitting on the Court of Appeals by assignment.
