Havana Dam

Havana DamDescription of Project: A general statement of WORK is as follows:
Purpose of WORK: The purpose the project was to restore the spillway back to its original location and geometry, in addition to providing erosion stabilization on the upstream and downstream ends of the spillway.

PROJECT Goals: The project goals included restoring the spillway back to its original location and geometry, adding riprap protection on the south side of the spillway, constructing a grouted boulder structure with a series of drops along the outfall channel, and installing sheet pile cutoff walls on the upstream and downstream ends of the entire structure.

Havana DamDescription of major WORK items: The spillway was composed of 8” thick concrete with reinforcing steel and a 3-foot deep toewall extending around the entire perimeter of the spillway. Buried soil riprap was placed on the south side of the spillway crest and extended down into the lower stages of Havana Pond. The grouted boulder drop structure featured three 4.5-foot drops that began at the downstream end of the spillway and continued along a curve that heads to the northeast. A weep drain system was constructed in the third downstream drop. A 10-foot deep sheet pile cutoff wall was installed along the breadth of the spillway and extended about 100 feet on either side. Another 10-foot deep sheet pile cutoff wall was installed along the toe of the third downstream drop and extended about 100 feet on either side of the grouted boulder structure. Riprap protection was placed on both sides of the cutoff wall outside of the grouted boulder limits. A portion of the sediment deposition caused by the dam breach needed to be removed from the site and the dam embankment below the proposed grouted boulder structure was reconstructed with approved imported material. All disturbed areas were restored with native seed and mulch.