The Cedar River approaches the city of Waterloo from the northwest. As it nears the city boundary, the main channel sweeps around a bend tó the eastward, while a lesser channel, known in the record as the “cut-off,” flows across the neck of the bend and reunites with the larger stream within the city limits. The defendant’s line of railway emerges from the business portion of the city, and extends in a northwesterly direction crossing the cut-off above mentioned. At the time when the road was constructed, this point of crossing was outside of the city limits, but, since that date, the boundary of the municipality has been extended to include the locality in question and for some distance beyond. The island lying between the greater and lesser channels of the river con*131tains about three hundred acres of land, the higher and dryer portion of which has been platted as a park or pleasure ground. Both sides of the principal channel in this vicinity are much resorted to in the summer season by the people of Waterloo and others. Before constructing its road, the railway company obtained a right of way from the owners of property traversed by its line, and waivers of claims for damage caused by overflow of water were also obtained from adjacent owners or some of them. Said road was constructed about the year 1897. No bridge was provided for crossing the cut-off but the roadway was carried over or across it on a solid embankment or fill. Later a public highway was established and opened immediately west of the fill and parallel thereto, and was carried across the cut-off on a wooden bridge erected by the city. A portion of the island is somewhat low and in times of extreme high water has been to a greater or less extent subject to overflow. A considerable part of the highway above mentioned in its course across the island is at times subject to inundation. When the floods are excessive, the waters sometimes break through or over the western bank of the cut-off, and flow over the surface or through swales in a southerly direction, and across a platted addition, to the city known as Westfield, where several manufacturing establishments are located. On the night of March 27, 1906, there was a heavy fall of rain with resulting high water in the streams. It is the claim of plaintiff that, on this occasion, the body of water in the cut-off above the fill made by the railway broke through said barrier, and washed away a portion of the embankment, taking with it the bridge constructed by the city, and otherwise injuring the highway. To prevent the reconstruction of said embankment and to compel the maintenance of an adequate opening therein.for the passage of the waters of the cut-off, this suit was thereupon instituted.
The petition sets forth the matters and things herein-*132before mentioned, and alleges that the effect of maintaining the fill constructed by defendant is to obstruct a natural water course; that such obstruction tends to increase the height of the floods above the crossing, and thereby fill the low places with water, which remains after the floods have subsided and creates stagnant pools; that the debris and foul matter thus deposited create unhealthful conditions, and materially interfere with the health, comfort, and convenience of residents and visitors in that neighborhood; that the floods so caused injure the public highways, and at times extend to the Westfield addition, depositing mud, sand, and other materials in its streets, and that the conditions complained of will continue indefinitely if the defendant is permitted to continue the obstruction of the cut-off. The defendant denies that the maintenance of the cut-off has caused, or can cause, any injury as alleged in the petition. It further avers that said fill was constructed with the consent of the riparian owners, and that, in fact, the maintenance of said fill has prevented the enlargement of the cut-off, which was otherwise liable to divert the main channel from its long established course, to the great injury of the public as well as of the adjacent owners of land. It also alleges that the filling of said channel was well known at the time by the city and its officers, who permitted the work to be done and the railway to be constructed there without objection or protest, and that the city is thereby estopped from maintaining this action. Other matters are mentioned in the pleadings, but none to which we need here specifically advert. At the close of the testimony, the trial court entered a decree finding for the plaintiff upon the principal fact questions in issue, and that the filling of the cut-off had the effect to raise the waters so held back to an unnatural level resulting in conditions, constituting a public nuisance, by reason of which the city was entitled to an injunction against its maintenance, but, the court not being fully *133advised as to the extent to which an opening should be made and maintained for the passage of water in the cut-off, an order was entered appointing a commission of three engineers to examine the premises and report thereon. A majority of the commissioners thereafter reported as follows:
(1) That the removal of the cut-off embankment for a space of eighty feet along the line of the fill will prevent any material increase of the flow of water upon the streets and grounds of the city in time of ordinary freshets.
(2) The dimensions of such opening should be eighty feet in length by fifteen feet in height.
(3) The location of the opening should be at the present channel of the cut-off. The type of construction recommended to provide for such opening is a through plate girder bridge eighty feet in length in the clear upon concrete abutments, the lowest member of which bridge not to be lower than the lowest member of the present steel railway bridge (over main channel) at San Souci Park.
(!) The estimated cost of such improvement is $7,500, and the time required for its completion ninety days.
On the coming in of this report, the court entered formal decree enjoining the defendant from maintaining the fill across the cut-off, unless the same be supplied with an opening therein at the present channel of eighty lineal feet along the line of the embankment and at least fifteen feet in height. The date of this entry was November 15, 1907, and the defendant was given time to March 1, 1908, to comply with the terms of the degree.
*134^ i. Public nuisance: obstruction to abaSrat: evidence. *133I. The appellant contends that the evidence wholly fails to sustain the claim that the effect of the fill was to increase the flood waters above it, or to increase the liability of flooding and injuring the streets and highways. Without reciting the testimony of individual wtnesses, an examination of the record convinces us that the finding of *134the trial court upon this feature of the controversy is correct. In the very nature of the case such * result was unavoidable. The course of the • cut-off from its point of departure from above the park to the point where they unite below is not to exceed half of the distance of the flow of the principal stream around the bend. The shorter course must, therefore, have averaged a materially greater fall per rod or per mile than the longer course, and the cut-off with the freedom of an open channel could scarcely fail to furnish material relief in carrying off th$ waters escaping from the main body. If it did not always serve to prevent the flooding of parts of the island, it would naturally help in keeping the inundation at a minimum, and in draining off the excess of water when the subsidence began. To fill the stream with a solid embankment was to build a dam which wholly arrested the flow. That this should to some extent increase the height of the floods above the dam and broaden the area of overflow and retard its recession was inevitable. That it should increase the obstruction of the public highway and the danger of obstruction or injury to the bridge beyond that which would exist without the fill is reasonably clear. There is also sufficient evidence that as a result of these overflows many pools were left to stagnate, and that from these and the decaying debris left by the floods disagreeable odors arose to the inconvenience and annoyance of the people in that vicinity, if not to the peril of the public health. Considerable testimony was directed to the question whether the fill in question caused the diversion of water overflowing the west bank and reaching the Westfield addition, but we think this phase of the case may be wholly disregarded, and still find the record sufficient to sustain the court’s finding that the effect of the fill was to create a nuisance.
*1352. Same: defenses. *134Moreover, if appellant’s contention be correct that the *135site of Westfield has always been subject to overflow, it would afford no' sufficient answer to the charge that the damming of the cut-off has a tendency to increase the diversion of water in that direction, and thereby enhance the severity of such floods.
3. Same. II. Appellant claims that having obtained waivers of damage from riparian owners, and having constructed the fill befqre the neighborhood was included within the city, it acquired a vested right to maintain such fill, which neither the city nor the court can rightfully impair by ordering the opening of a way for the passage of the stream. The riparian owners could estop themselves from objecting to the maintenance of the obstruction, and, so far as such obstruction constitutes a private nuisance to the injury of such property owners, the defendant may have acquired vested rights therein, but there can be no such thing as a vested right to maintain a public nuisance. Nor can a- right to maintain such nuisance be acquired by lapse of time or long-continued usage or by prescription. Commonwealth v. Upton, 6 Gray (Mass.) 473; Wright v. Moore, 38 Ala. 593 (82 Am. Dec. 731). Nor is it an answer to say that, when the work was done, it injured nobody, and has only become a source of trouble or annoyance because the increase of population has brought people within closer range of its objectionable influence. Douglass v. State, 4 Wis. 387; 29 Cyc. 1207.
It is upon the ground that the damming of the stream creates a public nuisance that relief against it was granted by the trial court, and upon that ground we think it may be maintained. To say nothing of the effect of the overflows upon public comfort or public health, the statutory duty of the city to keep its streets in repair and free from obstruction, and from the inroads of flood waters, is sufficient grounds to justify its insistence upon the opening of the channel to the natural flow of the stream. The fact that the fill was constructed before the city limits were *136extended to include its site does not exempt the defendant from the operation of the law in this respect. A dam or other obstruction of the stream may be lawful when made, but, if for any reason it later becomes or causes a nuisance, the legitimate character of its origin will not defeat an action for its abatement. State v. Close, 35 Iowa, 570; Yonkers v. Copcott, 140 N. Y. 12 (35 N. E. 443, 23 L. R. A. 485).
4. Same: police powers. Nor, as we have already suggested, is the general police power of the state or city to suppress nuisances in any manner limited by the fact that a nuisance did not develop into a source of injury to any one until the subsequent growth and expansion of the city brought people into a position to be injuriously affected by it. Bushnell v. Robeson, 62 Iowa, 547 (17 N. W. 888); Ashbrook v. Commonwealth, 1 Bush (Ky.) 139 (89 Am. Dec. 616).
5’ AME’ As between the property owner and the public, the inquiry goes to the conditions existing at the time when the complaint is made, and not to those prevailing at some more remote date in the past. The question to be decided here involves no vested right. Every owner of property holds title thereto subject to the .authority of the state to so regulate its use and enjoyment as to prevent and abate public nuisances, and the enforcement of that authority works no legal wrong. None of the authorities cited by counsel hold counter to this proposition. The law of the case is involved in no doubt, and we are of the opinion that the testimony sustains the decree of the trial court.
Eor the reasons stated, the decree is affirmed.