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New Creek Site 14, Grant County, WV

New Creek Site 14, Grant County, WV

Dam Rehabilitation Project

Submitted by Andy Deichert

The first construction year for the New Creek Site 14 Dam rehabilitation project has recently ended. In September 2010 the rehabilitation contract was awarded by USDA-NRCS-WV to Heeter Construction, Inc., from Spencer, WV. The Notice to Proceed was issued in January 2011. Federal funding (65%) for the project was provided to NRCS through the American Recovery and Reinvestment Act of 2009. Local funding (35%) was provided by the state and local sponsors—the West Virginia State Conservation Committee and the Potomac Valley Conservation District. The city of Keyser assisted NRCS with the reservoir drawdown prior to the start of construction.

New Creek Site 14 is located approximately 14 miles upstream of the City of Keyser on Linton Creek, a tributary to New Creek, in the northeastern portion of Grant County, WV. The stream flows in a northeasterly direction along State Route 93 and US Routes 50 and 220, through the City of Keyser in Mineral County, where it joins the North Branch of the Potomac River. The dam provides flood control for downstream areas and water supply to the City of Keyser.

The major items of work in the rehabilitation of the dam include replacement of the reinforced concrete riser intake structure, realignment and reinforcement of the auxiliary spillway utilizing roller compacted concrete, installation of a downstream toe and chimney drainage system, and flattening of the upstream and downstream slopes. The contract value to complete the rehabilitation work is approximately $10 million.

To date the contractor has installed erosion and sediment control measures, surface and subsurface dewatering measures, the majority of the downstream toe and chimney drainage system, flattened the downstream slope, extended the downstream end of the principal spillway pipe 60 feet, completed the subsurface grouting in the auxiliary spillway location, completed a significant portion of the required excavation for the auxiliary spillway improvements, removed most of the existing intake riser structure, and placed two pours on the new intake riser structure.

It is anticipated that the contractor will complete the flattening of the upstream slope of the embankment early in 2012 and place the roller compacted concrete stepped chute auxiliary spillway in the spring. Construction is estimated to be completed late in 2012 or early 2013.

Rehabilitation provides continued protection for downstream houses, businesses, utilities, and other infrastructure in the floodplain that has been constructed since the structure was first built. WV State Route 93 and US Routes 50 and 220 receive protection from flooding because of this dam.

The site provides wildlife habitat, wildlife viewing, scenery, and is a popular hiking area. It maintains existing stream habitat downstream of the dam by augmenting flows during dry weather conditions. The project retains the existing fish and wildlife habitat associated with the lake and the recreation benefits for anglers.

The watershed is situated in the headwater region of the Potomac River Basin. The dam traps 1.6 acre feet of sediment annually, thereby improving downstream water quality.

Reinforced concrete riser in take Structure under Construction with old riser in the background The reinforced concrete riser in-take structure is under construction in the foreground with the old riser in the background.
Aerial view of dam under construction chimney drain and downstream fill This aerial view shows the chimney drain and downstream fill.
Drilling and Grouting in auxiliary spillway Contractor employees are drilling and grouting in the auxiliary spillway.
This photo shows the drained reservoir with erosion and sediment control and surface diversion measures.
Excavation for downstream toe drainage system  A view of the excavation for the downstream toe drainage system.
Principal spillway extension and plunge pool construction The contractor is working on principal spillway extension and plunge pool construction. The downstream end of the principal spillway pipe was extended 60 feet.
Principal spillway and toe drain installation A landscape view of the principal spillway and toe drain installation.
Much progress was made on the principal spillway plunge pool.