National Dam Inspection Program. Storage Reservoirs Number 1 & Number 2 (NDS ID Number PA-653, DER ID Number 49-21). Susquehanna River Basin Unnamed Tributary to Shamokin Creek, Northumberland County, Pennsylvania. Phase I Inspect

摘要

The assessment of Storage Reservoir No. 1 and Storage Reservoir No. 2 is based upon visual observations made at the time of inspection, review of available records and data, hydraulic and hydrologic computations and past operational performance. Storage Reservoirs No. 1 and No. 2 appeared to be in fair condition. A heavy growth of trees is present on both downstream slopes. A wet area, located between the two embankments near the toe, was noted during the inspection. The reservoir drain valves have not been operated in the recent past. Maintenance of the dam and operating facilities is considered fair. Storage Reservoirs No. 1 and No. 2 are high hazard-intermediate size dams. The spillway design flood is the PMF (Probable Maximum Flood). The spillway and reservoir for Storage Reservoir No. 1 is capable of controlling approximately 35% of the PMF without overtopping the embankment. Storage Reservoir No. 2's spillway is capable of controlling only 10% of the PMF without overtopping the embankment. Based on criteria established by the Corps of Engineers, both spillways are termed seriously inadequate. If Storage Reservoir No. 1 or Storage Reservoir No. 2 should fail due to overtopping, hazard to loss of life and property downstream from the dam would be significantly increased from that which would exist prior to the overtopping. Storage Reservoirs No. 1 and No. 2 are classified as unsafe non-emergency dams.