Gooseberry River.-Between the forks in the river and the mouth, a distance of nearly 3 miles, there is one power site. If a low diversion dam were erected at mile 1.9 (about sec. 22, T. 54 N., R. 9 W.), a pipe line 4,500 feet long would make available at the foot of the falls 0.8 of a mile above the mouth, a head of 230 feet.

Beaver Bay River. The heaviest fall on this river is concentrated on the first mile above the mouth. Above that point the fall is not sufficient to be of value for power development on account of the small discharge.

A low diversion dam at the head of the falls in sec. 12, T. 55 N., R. 8 W., a mile above the mouth, with a pipe line 3,500 feet long (or canal and penstock) would make available at the foot of the falls a head of 300 feet.

Baptism River.-The greater portion of the fall on Baptism River occurs in the lower 3 miles of the river, above which the slope is very much less. If a diversion dam were built across the river 3.1 miles above the mouth (about sec. 3, T. 56 N., R. 7 W.) and a pipe line or canal constructed for approximately 11.000 feet, there would be an available head of 375 feet near the mouth.

Manitou River. Throughout the 5 miles of river that were surveyed there is a heavy fall. This is especially heavy between. miles 4 and 5, and in the first mile above the lake. There are two favorable developments on the river.

In sec. 10, T. 57 N., R. 6 W.-A dam 110 feet high one-half mile above the mouth where the river is in a rock gorge, with a pipe line 2,000 feet long would give a head of 255 feet at the mouth of the river.

About sec. 28, T. 58 N., R. 6 W.-At mile 4.4 the river flows between steep banks, so that a dam 60 feet high with a pipe line or canal 4,500 feet long would create a head of 250 feet at a point 3.5 miles above the mouth. If the canal were extended 1.5 miles further, there would be available an additional head of 150 feet, making a total head of 400 feet.

Temperance River. The heaviest fall on Temperance River occurs within 3 miles of the mouth. Although there is an additional fall of 70 feet in the next mile above, an important tributary enters at mile 3, so that a development should be below the forks to utilize the entire flow. A diversion dam at this point, which is in sec. 19. T. 59 N., R. 4 W., with a canal or pipe line 11,000 feet long, would give a head of 335 feet at the mouth of the river.

Cross River.-Within 2.8 miles of the mouth occurs the heaviest fall on Cross River. Above that section the fall is not sufficient

to make possible important developments. A diversion dam at mile 2.7 in sec. 25, T. 59 N., R 5 W., with a canal or pipe line 10,000 feet long, would give a head of 585 feet at the mouth.

Poplar River.-Almost the entire fall on Poplar River occurs within 3 miles of the mouth. At the upper end of this stretch there is a low logging dam. From this dam to the mouth of the river there is a fall of 610 feet which could be utilized for power by means of a canal or pipe line about 12,100 feet long. Above this logging dam the river has a further fall of more than 30 feet before reaching the general swamp level of the plateau. If the dam were raised by this amount, it would create a reservoir of 251 million cubic feet capacity which would be available in regulating the flow of Poplar River without reducing the power head below 610 feet.

Cascade River. This river has a fall of nearly 660 feet within 3.5 miles of its mouth, with a further fall of 180 feet in the next 3 miles. There are two feasible developments on this river as follows:

About sec. 26, T. 61 N., R. 2 W.-At mile 3.6 a diversion dam with a canal or pipe line 5,000 feet long would give a head of 210 feet.

In sec. 36, T. 61 N., R. 2 W.-1.8 miles above the mouth the river flows through a narrow gorge which is favorable for the construction of a 60-foot dam. With a dam of this height and a canal or pipe line 8,200 feet long, there would be available at the mouth of the river a head of 415 feet.

Devil Track River.-There are two favorable developments on Devil Track River as follows:

In sec. 34, T. 62 N., R. 1 E.-A diversion dam at mile 5.1, just below the outlet of Elbow Lake, with a canal or pipe line of 10,500 feet would give a head of 400 feet.

In sec. 10, T. 61 N., R. 1 E.-Just below the mouth of the South Branch a diversion dam with a pipe line or canal, 15,000 feet long would give a head of 470 feet.

Brule River.-In 6 miles above its mouth Brule River has a fall of 695 feet, which is fairly uniformly distributed. A diversion dam at mile 6.1 with a canal or pipe line approximately 5 miles long would make the entire fall available for development at the mouth of the river.

Pigeon River.-Unlike the other rivers in this drainage, the descent from the general plateau level to Lake Superior does not occur in the last few miles of its course, but extends over a distance of 30 miles with intervening stretches of river with little or no fall. For this reason high head developments comparable to those on the

other streams are not found, but instead there are 5 sites of moderate head as follows:

Outlet of South Fowl Lake.-A dam 65 feet high at this point with a canal and pipe line 6,500 feet long would give a total head of 150 feet. Below the tailwater for this development the river has very little fall for more than 3 miles, thus limiting the head available.

Partridge Falls. If a 23-foot dam were erected at the crest of Partridge Falls in sec. 30, T. 64 N., R. 5 E., it would overflow 1,150 acres of timbered land. The total head available from the crest of. the dam to the foot of the falls would be 75 feet.

At the High Falls in sec. 21, T. 64 N., R. 5 E.-A 16-foot dam at the crest of the high falls 17.4 miles above the mouth would overflow 100 acres of timber land and back the water 5 feet on the foot of Partridge Falls, reducing any development at that point by that amount. The 16-foot dam would make available at the falls a head of 150 feet. A canal and pipe line 10,200 feet long would increase the head to 290 feet.

In sec. 20, T. 64 N., R. 6 E.-At a point 9.9 miles above the mouth there is a favorable location for a 65-foot dam which would back the water nearly to the tailwater of the high falls site. About 450 acres of timber and brush land would be overflowed. A pipe line 200 feet long would give an available head of 80 feet.

In sec. 19, T. 64 N., R. 7 E.-Three thousand feet above the crest of the Big Falls the river flows through a narrow gorge. If a 160foot dam were built at this point it would overflow approximately 850 acres of timber and brush land, and would back the water 7.2 miles up stream to the tailwater of the preceding proposed development. A canal and pipe line 4,200 feet long would give an available head of 295 feet a short distance below the foot of the falls.

Available Water Supply.-Investigation of the runoff in the Minor Superior drainage basins was not started until the spring of 1911, so at this time there are available only fragmentary records for 1911 and 1912, which are insufficient for making power estimates.

LAWS AND REGULATIONS PERTAINING TO MINNESOTA STREAMS. OBSTRUCTION OF STREAMS.

NAVIGABLE AND NON-NAVIGABLE STREAMS.

The waters in the State may be divided into two classes-navigable and non-navigable. If a stream is capable of being used for the purposes of trade and commerce in any mode, even by a skiff or for floating logs, the stream is considered navigable. This definition of