On September 28, 1974, plaintiff Eric A. Lindgren was water skiing on a section of the Colorado River, south of Parker Dam. While making a run, plaintiff’s ski struck the river bottom, throwing plaintiff forward and causing him serious physical injury-

Plaintiffs filed their First Amended Complaint on February 26, 1979. The complaint named the United States as defendant and sought damages pursuant to the Federal Tort Claims Act (FTCA), 28 U.S.C. §§ 1346 (b) and 2671 et seq., for personal injury, negligent infliction of emotional distress and loss of consortium. Plaintiff’s complaint alleged that the U.S. Bureau of Reclamation, the agency in control at Parker Dam, had artificially altered the flow, the water level and the riverbed configuration of the Colorado River, and had thereby created a dangerous condition for users of the river. Plaintiffs further alleged that the Bureau had knowledge of the recreational use of the river and of the hazards posed to such users by the Bureau’s alteration; it was alleged that despite this knowledge, the Bureau had failed to post any warnings as to the dangerous condition of the river.

On May 25, 1979, the United States moved for summary judgment. The Government’s motion was based, in part, on the discretionary function exemption to the FTCA, 28 U.S.C. § 2680 (a), which provides in pertinent part:

On August 9,1979, the trial court entered summary judgment in the Government’s favor. In so doing, the Court held that the operation of Parker Dam constituted a discretionary activity within the meaning of the above statute and cited Spillway Marina, Inc. v. United States, 445 F.2d 876 (10th Cir. 1971).

Plaintiffs do not contest the trial court’s conclusion as to the discretionary character of dam operations. Their sole contention is that the Government’s failure to warn was not such an activity, and therefore that the trial court erred in entering summary judgment in the Government’s favor.

It may well be that the trial court’s ultimate conclusion as to the discretionary character of the Government’s failure-to-warn was correct. It may also be that even if the Government’s failure is found non-discretionary, the trial court will conclude that under the present circumstances, the Government was under no duty to warn. The problem with the Court’s ruling was its assumption that simply because the hazard which allegedly caused plaintiff’s injury was created through the exercise of a discretionary function, the Government’s failure-to-warn of the hazard was also discretionary. The trial court’s per-se approach to the issue was in error.

The leading decision interpreting the discretionary function exemption is Daleh- ite v. United States, 346 U.S. 15 , 73 S.Ct. 956 , 97 L.Ed. 1427 (1953). In that case, the Court established that the purpose of the exemption was to permit the Government to make planning-level decisions without fear of suit. Id. at 32 , 73 S.Ct. at 966 . According to the Court,

Id. at 32, 73 S.Ct. at 966 . Although the Daiehite Court declined to define the outer limits of “discretion”, it did go so far as to hold that discretion

Id. at 35-36, 73 S.Ct. 968 . (Footnote omitted.)

Although Daiehite remains an important statement of the policy behind the discretionary function exemption, subsequent decisions by the Supreme Court and various circuit courts have operated to narrow Da-iehite ’s definition of the term “discretion.” See e.g., Payton v. United States, 636 F.2d 132, 137-38 (5th Cir. 1981); Aretz v. United States, 604 F.2d 417, 427 (5th Cir. 1979); Bernitsky v. United States, 620 F.2d 948, 951 (3d Cir. 1980).

The prevailing test in the Ninth Circuit asks whether the act or omission occurred on the “planning level” of governmental activity or on the “operational level:”

Thompson v. United States, 592 F.2d 1104, 1111 (9th Cir. 1979). See also Driscoll v. United States, 525 F.2d 136, 138 (9th Cir. 1975). In addition to examining the level at which the act/omission occurred, this Court has also considered the ability of the judiciary to evaluate the agencies’ act/omission and whether judicial evaluation would impair the effective administration of the Government. See Driscoll v. United States, supra, at 138.

Plaintiffs cite several cases for the proposition that if the. exercise of a discretionary function creates or facilitates a hazard, the Government’s duty to warn can be actionable — notwithstanding the discretionary character of the hazard-causing act/omission. See e.g., Smith v. United States, 546 F.2d 872 (10th Cir. 1976) (Yellowstone Park visitor falls into thermal pool: decision to open park and decision whether to leave an area of park undeveloped were discretionary, but “the decision as to the posting of warning signs in the area must be judged separately .... ”); United States v. State of Washington, 351 F.2d 913 (9th Cir. 1965) (Aircraft hits unmarked electrical power line: even assuming location and erection of line was discretionary function, failure to provide suitable warning device was actionable); United Air Lines, Inc. v. Wiener, 335 F.2d 379 (9th Cir. 1964), cert. dism. sub nom. United Air Lines, Inc. v. United States, 379 U.S. 951, 85 S.Ct. 452 , 13 L.Ed.2d 549 (1964) (Air Force jet hits commercial airliner: under circumstances, failure to warn airliner of hazards created by instrument landing procedure being used by jet was actionable); United States v. White, 211 F.2d 79 (9th Cir. 1954) (Business invitee injured by unexploded shell while collecting scrap metal on Army firing range: assuming that decision not to undertake removal of hidden dangers was discretionary, the Government’s failure to warn of the known danger the invitee was likely to encounter was not); Everitt v. United States, 204 F.Supp. 20 (S.D.Tex.1962) (Boat accident: placement of log piles in bay for surveying purpose was discretionary, but failure to discover submerged pilings and warn thereof was not); Hernandez v. United States, 112 F.Supp. 369 (D.Hawaii 1953) (Vehicle accident: Government’s decision to erect road block was discretionary, but failure to adequately warn travellers was not); Worley v. United States, 119 F.Supp. 719 (D.Ore.1952) (Injury to hunter: Government’s decision to use coyote traps was discretionary, but failure to warn humans of danger was not).

The Government would distinguish plaintiffs’ cases on the basis that they did not involve dam operations. Under the Government’s theory, pursuant to the FTCA, Congress intended to place dam operations on a higher level than other “discretionary functions.” Failure to warn of hazards created by dam operations would never be actionable; it would always assume the discretionary character of the hazard-causing activity.

In support of its contentions, the Government relies on the following portion of the House Report of the Committee that adopted § 2680(a):

H.R.Rep.No. 2245, 77th Cong., 2d Sess., p. 10, quoted in Dalehite v. United States, 346 U.S. at 29 n. 21, 73 S.Ct. at 964 . (Emphasis added). The Government also relies on several water cases which refer to the above language. See Wright v. United States, 568 F.2d 153 (10th Cir. 1978) (No liability to plaintiffs whose car crashed into creek: Government’s act of assisting state with planning and construction of bridge was discretionary, insulating it from claim that negligent design, construction and placement caused bridge to wash out); Konecny v. United States, 388 F.2d 59 (8th Cir. 1967) (Government not liable for “taking” plaintiff’s shoreline property by raising the water level of lake); Coates v. United States, 181 F.2d 816 (8th Cir. 1950) (Government not liable for damage to farmer’s land by changing flow of river to improve transportation waterway).

While it is clear from the above history that Congress intended dam operations to fall within the scope of the discretionary function exception, we find no indication that dam operations are elevated to a position different from any other discretionary function.

The cases cited by the Government suggest nothing to the contrary. None involved allegations of failure to warn. They simply establish what plaintiffs have already conceded — that the Government’s regulation of the river was a discretionary function.

The Government’s most persuasive case is Spillway Marina, Inc. v. United States, 330 F.Supp. 611 (D.Kan.1970), aff’d, 445 F.2d 876 (10th Cir. 1971). But that case too is distinguishable.

Plaintiff in Spillway had a state concession to operate a marina on the banks of a federal reservoir. In the fall of 1966, it became necessary for the Corps of Engineers to lower the water level of the reservoir to maintain the navigational quality of the Missouri River and to accomplish some construction and repair work. The marina’s complaint alleged that this drawdown damaged its dock facilities and that it was done without authority, without warning, and in violation of the marina’s concession agreement.

The district court held that the Government’s decision to lower the water level was clearly a discretionary function. 330 F.Supp. at 612-13 . In response to plaintiff’s argument that it was lack of notice, rather than the actual lowering of the water level, that caused the damage, the court stressed that notice would be highly impractical:

Id. at 613 .

On appeal to the Tenth Circuit, plaintiff withdrew his argument that the drawdown was unauthorized and placed sole reliance on his argument that the Government was negligent for failing to warn that the draw-down would occur. The Tenth Circuit affirmed, emphasizing that the decision when to release and store water required discretion, and reasoning that “the argument of Spillway goes to the manner of exercise of a discretionary function.” 445 F.2d at 878 .

This Court rejects the Government’s reading of Spillway as standing for the proposition that, in the dam context, all failure to warn assumes the discretionary cloak of the operation itself. While it is indeed possible that a particular failure to warn might be discretionary, each failure must be analyzed separately.

In Spillway, the exercise of discretion (i.e., the lowering of the water level) was primarily responsible for the damage for which plaintiff brought suit. In the case before this Court, the discretionary act did not produce any direct damage — it produced a hazard. The damage required an act on plaintiff’s part (water skiing). In this respect, the Spillway case is more aligned with the cases cited by the Government that did not involve failure to warn. This case, however, is more analogous to the authority relied on by plaintiff. E.g., White v. United States, supra.

To permit recovery in a Spillway situation would require the Government to analyze each act of discretion to determine (1) whether it would damage anyone, (2) whether a warning would reduce that damage, and (3) whether warnings would be feasible under the circumstances. To oblige the Government to ask these questions before each discretionary act would seem to constitute a great interference with Governmental administration. Under the facts of Spillway, for example, the Government would have had to warn the marina, and all other persons who would suffer damage from a lowering of the water level, each time the water level was lowered.

In contrast, the “hazard” cases often require only one-time warnings, and are therefore not as administratively burdensome. See e.g., Smith v. United States, supra; United States v. State of Washington, supra. In the present case, for example, plaintiff would have the Government post signs informing the public that the Government is causing the water level to fluctuate without notice, and that the public should beware of dangers that might be caused thereby. The Government is not, as in Spillway, being asked to notify the public each time it changes the water level in a manner so as to threaten damage.

Conclusion

This matter should be remanded to the trial court for its consideration whether, under the prevailing test in this Circuit, the Government’s failure to warn was discretionary. See Thompson v. United States, supra; Driscoll v. United States, supra.

It must be remembered that the question whether the discretionary function exemption applies is simply one of subject matter jurisdiction. See Smith v. United States, supra, at 875-76; United States v. White, supra, at 82, note 3. A finding that the Government cannot use the exemption in no way affects the questions (1) whether the Government’s failure to post signs constituted negligence, see Payton v. United States, supra, at 144, or (2) whether the Government’s failure is actionable under state law, as required by the FTCA. See e.g., United Scottish Ins. Co. v. United States, supra; Phillips v. United States, 590 F.2d 297 (9th Cir. 1979).

REMANDED for further consideration in accordance with the views expressed in this Opinion.