for the individual units of the comprehensive plan referred to above. No further expenditures are contemplated under the general project for flood control in the Merrimack River Basin. For final cost and financial summary, see Annual Report for 1946.

22. FRANKLIN FALLS RESERVOIR, MERRIMACK RIVER BASIN, N. H.

Location. The dam is located on the Pemigewasset River in New Hampshire, the main tributary of the Merrimack River, and is about 211⁄2 miles upstream of Franklin, N. H. (See U. S. Geological Survey maps for Penacook and Holderness, N. H.)

Existing project. The dam is of the rolled-earth type with a dumped rock shell. It has a top length of 1,740 feet, a top width of 25 feet, and a height of 140 feet above river bed. The spillway is located on rock in the right abutment and is a low, concrete weir with a crest length of 546 feet. The spillway approach and discharge channels are in earth and rock cut and are 1,785 and 900 feet in length, respectively. The outlet works are on the right bank of the river and consist of an intake channel 840 feet long, and two 22-foot horseshoe-shaped conduits each 542 feet long and each controlled by 4 broome gates operated through a control tower from a gatehouse above. The outlet works also have a stilling basin and an outlet channel with a length of 2,350 feet. The reservoir is operated for flood control purposes and has a storage capacity of 154,000 acre-feet which is equivalent to 2.9 inches of runoff from its drainage area of 1,000 square miles.

The cost of the completed project was $6,169,500 for construction and $1,752,000 for lands and damages, a total of $7,921,500. The latest (1955) approved estimate for annual cost of operation and maintenance is $30,000.

The project is a unit of the comprehensive plan for flood control and other purposes in the Merrimack River Basin which was authorized by the Flood Control Act approved June 22, 1936, and modified by the Flood Control Act approved June 28, 1938.

Local cooperation. Section 2 of the Flood Control Act approved June 28, 1938, applies.

Operations and results during fiscal year. New work: None. Maintenance: Operations consisted of a periodic checking of gates and operating equipment, and general maintenance of roads, buildings, and grounds.

Reservoir operation: There was one period of regulation at Franklin Falls Reservoir during the year. In September 24,000 acre-feet of storage, 16 percent of the total capacity, was utilized. The computed peak inflow was 27,000 c. f. s. and the maximum regulated outflow was 16,000 c. f. s.

Total costs during the fiscal year from regular funds amounted to $23,252, all maintenance funds.

Condition at end of fiscal year. tion of the dam and appurtenant and completed in October 1943. $8,177,710, of which $7,921,531 maintenance.

The project is complete. Construcworks was initiated in November 1939 Total costs for the project have been was for new work and $256,179 for

23. EDWARD MacDOWELL RESERVOIR (FORMERLY WEST PETERBOROUGH RESERVOIR), MERRIMACK RIVER BASIN, N. H. Location. The dam is located on Nubanusit Brook, a tributary of the Contoocook River, and is one-half mile upstream from the village of West Peterborough, N. H., and 14 miles east of Keene, N. H. (See U. S. Geological Survey maps for Peterboro and Monadnock, N. H.) Existing project. The dam is of the rolled-earth type with a dumped rock blanket on the upstream face and a downstream rock toe. It has a top length of 1,030 feet, a top width of 25 feet, and a maximum height of 67 feet. The outlet works located in the west abutment of the dam consist of an intake structure, a 7-foot square conduit which is 275 feet in length and is controlled by three 3-foot by 7-foot slide gates mechanically operated through a control tower from a gate house above, and a stilling basin emptying into the pool of the Verney Mills Dam. The spillway is a low, concrete weir, 100 feet in length, with a 1,900-foot long approach channel, a 3,080-foot long discharge channel, and a 2,540-foot long protective dike to guide the spillway discharge. The spillway is located in a natural saddle on the north side of the reservoir approximately 3 miles from the dam site and discharges into Ferguson Brook which, in turn, discharges into the proposed Bennington Reservoir. The reservoir is operated for flood control purposes and has a storage capacity of 12,800 acrefeet which is equivalent to 5.5 inches of runoff from its drainage area of 44 square miles.

The cost of new work for the completed project was $1,702,000 for construction and $306,000 for lands and damages, a total of $2,008,000. The latest (1955) approved estimate for annual cost of operation and maintenance is $18,000.

The project is a unit of the comprehensive plan for flood control and other purposes in the Merrimack River Basin which was authorized by the Flood Control Act approved June 22, 1936, and modified by the Flood Control Act approved June 28, 1938. The name "Edward MacDowell Dam" was adopted by section 206 of the Flood Control Act approved May 17, 1950.

Local cooperation. Section 2 of the Flood Control Act approved June 28, 1938, applies.

Operations and results during fiscal year. New work: None. Final payments were made in connection with land acquisition. Costs from regular funds were $8,058.

Maintenance: Operations consisted of periodic checking of gates

and operating equipment, and general maintenance of roads, buildings and grounds. Costs from regular funds were $15,149.

Reservoir operation: The reservoir was regulated in September to reduce flows on the Nubanusit Brook. The maximum storage utilized was 1,200 acre-feet, or 9.4 percent, of the total capacity. The computed peak inflow was 550 c. f. s. The maximum regulated outflow to empty the reservoir was 300 c. f. s. In April 1,100 acre-feet, or 8.6 percent of the total storage capacity was utilized. During this period the outflow was restricted to 180 c. f. s. The maximum regulated outflow to empty the reservoir was 420 c. f. s.

Total costs during the fiscal year from regular funds were $23,207. Condition at end of fiscal year. The project is complete. Construction of the dam and appurtenant works was initiated in March 1948, and completed in March 1950. Total costs for the project have been $2,102,410, of which $2,007,821 was for new work and $94,589 was for maintenance.

24. BLACKWATER RESERVOIR, MERRIMACK RIVER BASIN, N. H. Location. The dam is located on the Blackwater River in New Hampshire, 8.2 miles above the confluence with the Contoocook River and 118.8 miles above the mouth of the Merrimack River. It is in the town of Webster, just above the village of Swetts Mills, 12.5 miles by highway northwest of Concord, N. H. (See U. S. Geological Survey maps for Penacook and Mount Kearsarge, N. H.)

Existing project. The dam is of the rolled-earth type with a dumped rock blanket on the upstream face and a downstream rock toe. It has a top length, including spillway, of 1,150 feet, a top width of 39 feet and a maximum height, above river bed, of 75 feet. There are also five earth dikes on the west side of the reservoir having a respective length of 335, 170, 735, 175 and 240 feet and a respective maximum height of 29, 16, 40, 9, and 18 feet. The spillway is of the concrete, gravity type with a length of 240 feet and has a 160-foot long approach channel and a 400-foot long discharge channel. The outlet works are in the spillway and consist of three conduits, each controlled by a 3-foot 6-inch by 5-foot 3-inch slide gate hydraulically operated from a gallery within the spillway. The dam and appurtenant works contain a 16-foot diameter penstock intake and have been constructed to provide for future raising and the inclusion of power at the site. The reservoir is operated for flood control purposes and has a storage capacity of 46,000 acre-feet which is equivalent to 6.7 inches of runoff from its drainage area of 128 square miles.

The cost of the completed project was $764,000 for construction and $553,000 for lands and damages, a total of $1,317,000. The latest (1952) approved estimate for annual cost of operation and maintenance is $7,000.

The project is a unit of the comprehensive plan for flood control and other purposes in the Merrimack River Basin which was authorized by the Flood Control Act approved June 22, 1936, and modified by the Flood Control Act approved June 28, 1938.

Local cooperation. Section 2 of the Flood Control Act approved June 28, 1938, applies.

Operations and results during fiscal year. New work: None.

Maintenance: Operations consisted of periodic checking of gates and operating equipment, and general maintenance of roads, buildings, and grounds. Costs from regular funds were $6,164.

Reservoir operation: There were two periods of regulation to reduce flood flows at Blackwater Reservoir during the year.

In September the maximum storage utilized was 3,000 acre-feet, or 7 percent, of the total capacity.

In June the outflow was restricted during a minor rise in river stage resulting from heavy rainfall. The storage utilized was negligible. Total costs during the fiscal year from regular funds were $6,164. Condition at end of fiscal year. The project is complete. Construction of the dam and appurtenant works was initiated in May 1940, and completed in November 1944.

Total costs for the project have been $1,376,622, of which $1,316,864 was for new work and $59,758 for maintenance.

25. BLACKSTONE RIVER BASIN, MASS., AND R. I.

Location. The works covered by this project consist of a dam and reservoir on the West River and local protection works at three cities on the Blackstone River.

Existing project. The Flood Control Act approved December 22, 1944, authorized the plan for a reservoir on the West River and local protection works at Worcester, Mass., and Woonsocket and Pawtucket, R. I., substantially in accordance with House Document No. 624, 78th Congress, 2d session.

The following individual projects comprise the authorized plan.

26. WOONSOCKET, BLACKSTONE RIVER BASIN, R. I.

Location. The project is located on the Blackstone River within the city of Woonsocket, R. I., approximately 13 miles north of Providence, R. I. (See U. S. Geological Survey maps for Georgiaville, R. I., and Blackstone, Mass.-R. I.)

Existing project. The project provides for the replacement of the existing Woonsocket Falls Dam with a new concrete overflow dam 250 feet long, to be constructed on rock. The dam will be equipped with two drum type gates, each 125 feet in length, to maintain the present pool level during low river stages. The project also provides for the widening, deepening, and straightening of the present river channel for a distance of 6,600 feet upstream from the dam to the Singleton Street Bridge and for the alteration of the present Edward Street footbridge and the Sayles Street Bridge. The improvements, together with the reductions in flood discharge to be realized by the construction of the West Hill Reservoir, will provide protection against the maximum flood of record for adjoining areas in Woonsocket.

The estimate of cost for new work (1955) is $2,020,000 for construction and $172,000 for bridge alterations, lands, and rights-of-way. The existing project was authorized by the Flood Control Act approved December 22, 1944 (H. Doc. 624, 78th Cong., 2d sess.).

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