found to be ten and sixty nine hundredths feet, 10.69 ft. From the Heron Lake to the station sixty one, we could find no perceptible fall of the stream, and it is therefore assumed to be as one lake from the dead water at the foot of the outlet of the Chamberlain Lake, to the said station 61.

From this station we proceeded down the stream to find a suitable place for a dam, which could not be found at the foot of the dead water in consequence of the very low banks. At a distance of about eighty rods a location was found, and this point was considered as the best, for turning the water into the East Branch.

The fall from station 61 to the site of the dam was found to be 5.50 feet.

Thus making the whole fall from Lake Telos to the site of the dam, as follows:

Line A D. Making the whole fall 17.02 feet, and the fall from the level of Lake Telos to the Penobscot Lake, is forty two feet, making the point marked C on the plan twenty five feet higher than the water on the Penobscot.

The method of connecting these waters in the most efficient and permanent manner, for the intended use, appears to be, to cause the current or part of it, at least, to flow into the Penobscot permanently. And this may be accomplished by building a dam as before mentioned, at the point C, on the map, and finishing the connection by cutting down the natural shore of the Telos Lake at the point A, and also by deepening the channel between this Lake and the Chamberlain Lake, and removing some of the rocks at the outlet of the last mentioned lake. To effect this object it is proposed to build a dam at the point marked C on the plan, eighteen feet high, which would flow the Heron Lake twelve and a half feet, and the Chamberlain dam 1.81 feet, and the Telos Lake one foot nearly. The greatest depth of water required to float logs will be four feet.

The head of the outlet of the Chamberlain Lake will require to be deepened from six to nine inches, which can be easily done. The channel between the Chamberlain Lake and the Telasinis will require deepening two feet, for a distance of one hundred yards, and the one between this and the Telos Lake to about the same extent. This it is believed will enable persons to bring logs from the lower lake to Telos Lake at any time.

The cut at the Telos will require to be five hundred and seventy two yards in length, and average depth of 1.94 yards, and twenty two yards wide, making an amount of excavation of twenty four thousand six hundred and twelve yards.

This cut will be through a soil composed of clay and gravel, mixed with large and small boulder stones, some of which will require blasting before they can be removed.

After passing through this canal the water has a free passage into the Penobscot Lake, and from thence by the Webster brook into the east branch of the Penobscot.

Webster Brook. This is a small stream, running in a channel much inclined, and broken by ledges in several places into fallscausing the logs to jam, when too many are put in at once, or not properly attended to. In increasing the quantity of water beyond the natural flow, the depth and velocity will be immediately increased, and thus produce an increased action upon the bed of the stream, the most probable result of which is, a widening of the channel, or by scouring out the bottom, deepening the stream. But this latter result is not common.

In this case, many parts of the stream will widen, and to prevent the water becoming too shallow, some of the largest rocks must be removed, and the bed of the stream be deepened, where it is necessary.

A dam will also be required at Lake Telos, in order to control the water in the stream, while driving the logs.

The second plan is to build a dam as before proposed at C, to flow the water sufficiently high in the Chamberlain Lake to pass the 1ogs part way through it, and then by means of one or more dams or locks, pass them into Chamberlain Lake.

The point most suitable at the Chamberlain outlet, is at No. 20, where the banks are high on each side. The fall from the Lake to the level of the stream at this point is 525 feet; the banks will admit of a dam twenty feet high if necessary.

As the Lake flows but slowly (four inches in twenty-four hours being the maximum) another dam would be required at or near the upper end of the outlet, provided with gates similar to the second

one.

The first dam at C, would require to be fourteen feet high in order to flow a sufficient basin to hold the logs; this would give an area of about 11220 square yards, or sufficient room for twelve hundred logs.

The second dam, which must be built with gates, would be, if the Lake is to be flowed, after all the logs are through, seven feet high.

If however it is thought best to keep the Lake flowed, which is probably the best course, it must be built sixteen feet high.

The third dam, which is also to be built with gates, must be high enough to flow across the land dividing the Telos and Penobscot Lakes; this will require a dam of nine feet.

This mode would therefore require simply three dams, one of fourteen, one of sixteen, and one of nine feet high. The excavation already made at Telos, with the dam and sluices there, being already sufficient (with nine feet head at the Chamberlain Lake) for the transportation of logs into the Penobscot.

The dam before mentioned at C, on the plan, which must be built, whichever of the two methods may be adopted, will be for the main dam 49 yards in length, the wing on the east side 80 yards, and on the west side 88 yards, making the whole length 217 yards.

This great length is required, as will be seen by the profile of the cross section of the stream, in consequence of the banks rising very slowly after arriving at the distance of about twenty-five yards on each side from the bank; but as the wings after passing this distance are low, the work is not of so great magnitude as it at first appears to be.

This dam may be built either of framed sections placed at proper intervals, and covered with hewed plank, or of cribwork of rough timber filled with stone and covered in a like manner.

A waste way from two to three feet deep, and the width of the stream to be left for the discharge of the surplus water, and the bottom of the stream below secured to prevent the undertow or back roll of the water undermining and destroying the work.

This may be prevented in part by breaking the down stream side of the dam into steps, as shown in the annexed section, and by further securing the bottom with an apron of timber to a sufficient distance to insure stability.

The dimensions of this dam upon which the estimates are based, are 60 feet on the bottom for the main dam, seventeen feet high at the waste way, and twenty feet high at the wings; the main dam to be 147 feet in length, with the wings built in the ordinary way of building timber dams, and length as before described. The cost of this dam is estimated at $7000, or if the crib work is carried throughout, and drawing in gradually from the centre toward each extremity on the base, at $9,000, and for the framed dam $5,500, if loaded with stone, and the wings built as before mentioned, or $7,500 if the plan is continued the whole length of the dam.

Should the second method proposed for turning the water be adopted, this dam might be constructed for a sum from $1,500 to $2,000 less than this estimate.

The second dam at the Chamberlain outlet will require to be built with gates and piers, and comparing it with similar works on the Penobscot, would cost from six to seven thousand dollars.

The upper dam being lower, would cost not far from four thousand dollars. This would make the cost of the second method, in case the dam below is built at the first mentioned estimate, reduced

It will be seen that the cost of the two methods vary but little, and this difference is still less by adding to the second plan the sum of $500 for clearing the Webster stream, which is common to both methods.

The greatest objection to the second method proposed, is the cost of maintaining so many dams with the necessary gates and machinery which are always liable to injury from the ice and drift stuff.

If one dam alone is built, this evil will be avoided, and the cut at Telos being permanent, would supply at all times additional water to the Penobscot, and the whole work being of a durable character would render the cost of annual repairs and attendance much less than the other.

A large number of streams large enough for driving logs, flow into the Allagash below the Chamberlain Lake, and although they have not been explored sufficiently to determine with exactness how large a territory they flow through, still enough is known to prove that a tract of country containing from eight to ten townships, is watered by these streams, and that the timber can by them be brought into the Allagash river, and from thence by means of the contemplated improvements, into the Penobscot.

The townships, part of which have been surveyed, which it is supposed will be increased in value by making this connection with the Penobscot, are west half of No. 10, in the 10th range; half of No. 8, No. 9, and half of No. 10, in the 11th range; half of No. 7, No. 8, No. 9, and half of No. 10, in the 12th range; half of