Boiling Springs Dam Rehabilitation – Structure Site No.1
Boiling Springs 1 is an existing dam structure that was constructed in 1973 in Latimer County, Oklahoma. It has operated for 45 of its 50-year design life. This site was originally designed as a low hazard structure. This dam structure has been re-classified as a high hazard due to downstream development.
The Boiling Springs Site 1 was hydraulically inadequate for high hazard classification. Affinis, as part of the Ad Astra team, was selected by the National Resource Conservation Service for the dam rehabilitation project. The Ad Astra Team will provide a design meeting current dam safety criteria and performance standards for a high hazard class structure. The design life will be extended to 100 years from the completion of construction.
Based on the 2016 Supplemental Watershed Plan, the preferred alternative included abandoning the existing 30-inch principal spillway (PS) conduit in-place and installing a new 30-inch PS conduit with a new tower and impact basin, filling in the existing 50-foot-wide earthen auxiliary spillway on the right abutment, and constructing a 180-foot wide Roller Compacted Concrete (RCC) spillway over the embankment. This spillway configuration does not require a dam raise and keeps the conservation pool and principal spillway crest at the same elevation as the existing. This is beneficial, because there is an existing home downstream of the dam that cannot be impacted by increasing the dam footprint near the home. Also, the RCC spillway will require an 11-cell reinforced concrete box bridge that Affinis is designing to allow vehicles to maintain the same access across the dam.
Our team started by gathering information about the site. We conducted a site visit, reviewed the hydraulic and hydrologic reports, performed an early alternatives evaluation, and worked with a partner to collect geologic and soil mechanics data for the area. Each of these items was used to inform the design which is currently underway.