Overview
Pactola Dam is situated at a point along Rapid Creek where the valley narrows and the creek has cut through a resistant, northwest trending ridge. Rocks at the dam consist of a complex series of schists, slates and amphibolites lying in nearly vertical beds which strike in a northwest direction. There is a small fold in the right abutment that modifies the strike of the beds and causes the axis of the dam to cross some beds twice. The schistosity for the most part parallels the original bedding. The amphibolite schist rocks are hard, jointed and usually weathered to shallow depths. The slate beds contain abundant iron pyrite which weathers readily above the water table.
General
| Project | PSMBP-Rapid Valley Unit |
| Longitude | -103.4883 |
| Watercourse | Rapid Creek |
| Reservoir | Pactola |
| Original Construction | 1952-1956 |
| National ID Number | SD01139 |
| Latitude | 44.0717 |
| Modified Construction | 1987 |
Dimensions
| Structural Height | 245.00 ft |
| Crest Length | 2236.00 ft |
| Top of Active Conservation Pool (Elevation) | 4580.00 ft |
| Top of Inactive Conservation Pool (Elevation) | 4456.10 ft |
| Spillway Crest Elevation | 4621.50 ft |
| Streambed at Dam Axis | 4422.00 ft |
| Crest Elevation | 4655.0 ft |
| Hydraulic Height (Normal Operating Depth at Dam) | 199.50 ft |
| Top of Dead Storage Pool (Elevation) | 4440.00 ft |
Hydraulics & Hydrology
| Spillway Capacity at Elevation | 245000.0 cfs at 4651.7 ft |
| Outlet Works Capacity at Elevation | 1150.0 cfs at 4633.7 ft |
| Normal Water Surface Elevation | 4580.0 ft |
| Auxiliary Spillway | No |
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