W. KERR SCOTT DAM AND LAKE PROJECT YADKIN-PEE DEE RIVER BASIN, NC PERTINENT DATA Other names During the design and construction phases, the project was known as the Wilkesboro Reservoir. In 1963 the dam was completed and placed in operation and the name was changed to honor William Kerr Scott, 1896-1958, former Governor and Senator from North Carolina. Location of dam At Latitude 36 081 04'1, Longitude 81 13' 30"; in Wilkes County, NC, about 4 miles west of Wilkesboro, North Carolina. This location is about 55 miles west of Winston-Salem, NC, and about 65 miles north of Charlotte, NC. The dam is 5.8 river miles upstream of the USGS stream gage at Wilkesboro, NC, about 26 river miles above Elkin, NC, 132 river miles above High Rock Dam near High Rock, NC, and 388 river miles upstream of the mouth of the Pee Dee River in Winyah Bay near Georgetown, South Carolina. Purposes For flood control, water supply, recreation, and low flow releases. Drainage areas Square Miles Yadkin River at Patterson, NC ---------------- 29 Elk Creek at Elkville, NC -------------------- 48 W. Kerr Scott Dam near Wilkesboro, NC--------- 367 Reddies River at North Wilkesboro, NC -------- 89 Yadkin River at Wilkesboro, NC --------------- 504 Roaring River near Roaring River, NC --------- 128 Yadkin River at Elkin, NC -------------------- 869 Yadkin River at Enon, NC --------------------- 1,694 Yadkin River at Yadkin College, NC ----------- 2,280 Yadkin River at High Rock, NC ---------------- 3,973 Pee Dee River at mouth (approximate) --------- 18,500 Elevations Feet, m.s.l. Original Spillway design flood---------------- 1102.5 July 1992 spillway design flood--------------- 1105.2 Standard project flood------------------------ 1083.0 Flood of record August 1940 computed---------- 1074.5 Top of Dam------------------------------------ 1107.5 Base of Dam----------------------------------- 965.0 Maximum design pool--------------------------- 1102.5 Top of flood control pool (spillway crest)---- 1075.0 Top of normal pool (bottom of flood pool)----- 1030.0 Minimum operative pool------------------------ 1000.0 Upper clearing limit-------------------------- 1032.0 Guide acquisition line------------------------ 1047.0 Elevation to which flowage easement obtained-- 1080.0 Conduit entrance portal invert elevation------ 965.0 Conduit exit portal invert elevation---------- 960.0 Stilling basin bottom elevation--------------- 952.0 Stilling basin end sill elevation------------- 955.5 Tailwater elevations: Original spillway design flood---------------- 998.0 July 1992 spillway design flood--------------- 999.4 Standard project flood------------------------ 984.6 Flood of record (August 1940)----------------- 973.7 Minimum (125 c.f.s.)-------------------------- 963.0 Reservoir Data Runoff Inches Acre-feet Storage Volumes: Original spillway design flood (elev. 1102.5)- - 290,000 Latest spillway design flood (elev. 1105.2)--- - 328,300 Standard project flood (elev. 1083)----------- - 190,000 Top of dam (elevation 1107.5)----------------- - 347,300 Maximum design pool (elev. 1102.5)------------ - 306,000 Top of flood control pool (elev. 1075.0)------ - 153,000 Top of normal pool (elev. 1030.0)------------- - 41,000 Top of minimum operative pool (elev. 1000.0)-- - 8,000 Uncontrolled flood storage ( 1075.0-1102.5)--- 7.82 153,000 Controlled flood storage ( 1030.0-1075.0)----- 5.72 112,000 Water supply storage (1000. 0-1030.0)--------- 1.69 33,000 Sediment and conserv. sto. (below 1000.0)----- 0.41 8,000 Surface areas: Acres Original spillway design flood (elev. 1102.5)-------- 7,240 Latest spillway design flood (elev. 1105.2)---------- 7,590 Standard project flood (elev. 1083)------------------ 4,835 Maximum design pool (elev. 1102.5)------------------- 7,240 Top of flood control pool (elev. 1075.0)------------- 4,000 Top of normal pool (elev. 1030.0)-------------------- 1,475 Top of minimum operative pool (elev. 1000.0)--------- 675 Counties affected------------------------------------Wilkes,Caldwell Length at elevation 1030.0 ft. m.s.l. Miles Reservoir, (along Yadkin River)--------------------- 9.7 Shoreline------------------------------------------- 55 Dam and Spillway Type: Earth and rockfill (zoned), with side channel uncontrolled spillway, intake structure, and circular conduit Length of dam (feet)---------------------------------- 1,750 Length of spillway crest (feet)----------------------- 400 Spillway capacity at elevation 1105.2 (c.f.s.)-------- 199,300 Height of dam (feet)---------------------------------- 148 Outlet Works: Intake tower: Conduit intakes: Number-------------------------------------------- 2 Size-------------------------6 feet wide by 12.25 feet high each Conduit length (feet)----------------------------- 749.0 Conduit diameter (feet)--------------------------- 12.25 Max. discharge (approximate) at elevation 1030 (c.f.s.) 5,300 Service Gates: Number-------------------------------------------------- 2 Size--------- 6 feet 9 inches wide by 12 feet 8 inches high each Emergency Gate: Type:----- Gravity/electric hoist on a hand-operated trolly hanging from a monorail located on top of the intake tower. Gate is dogged and stored just above the outside platform at elevation 1033 feet m.s.l., on the face of the intake tower. Number:---------------------------------------------- 1 Size:--------------6 feet 9 inches wide by 13 feet 8 inches high Stilling basin: Minimum width (feet-inches)------------------------------- 12-3 Maximum width (feet-inches)------------------------------- 54-1 Estimated Natural Streamflow at Dam c.f.s. Mean discharge for period 1922-1991------------------------ 581 Minimum discharge: Instantaneous prior to 1963 (September 28, 1954)---------- 72 Daily prior to 1963 (September 18, 1956)------------------ 80 Monthly for period 1922-1991 ( October 1954)-------------- 112 Maximum discharge for period 1922-1991: Instantaneous (August 14, 1940)--------------------------- 116,500 Monthly (August 1940)------------------------------------- 3,050 Bankfull discharge below dam------------------------------ 5,400 Standard Project Flood Maximum estimated outflow---------------------------------- 29,000 Maximum estimated inflow----------------------------------- 193,100 Original Spillwav Design Flood Derivation: Runoff based on analysis of the greatest 48-hour period of Probable Maximum Precipitation storm rainfall from the U. S. Weather Bureau (National Weather Service) Hydrometeorological Report No. 33, using a drainage area of 348 square miles. Total average rainfall (inches)--------------------------- 25.6 Initial loss (inches)------------------------------------- 0.50 Average infiltration rate (inches per hour)--------------- 0.10 Total storm runoff (inches)------------------------------- 21.5 Peak inflow to full reservoir (c.f.s.)-------------------- 318,000 Regulated peak outflow (c.f.s.)--------------------------- 183,000 Spillway Design Flood (July 1992) Derivation: Runoff based on analysis of the greatest 72-hour period of Probable Maximum Precipitation from the National Weather Service Hydrometeorological Report No. 52, using a drainage area of 367 square miles. Total average rainfall (inches)-------------------------- 31.3 Initial loss (inches)------------------------------------ 0.50 Average infiltration rate (inches per hour)-------------- 0.10 Total storm runoff (inches)------------------------------ 24.9 Peak inflow to full reservoir (c.f.s.)------------------- 326,600 Regulated peak outflow (c.f.s.)-------------------------- 206,200