This report presents a technical valuation of the damages from dumping accumulated dam sediments in the Anchicaya River on Colombia's Pacific Coast. The unplanned discharge of more than 500,000 cubic meters of sludge in 2001 resulted in shocks to vulnerable ecosystems, severe damage to fish and shellfish, and harm to water supply, crops, and riverine and coastal mangroves. Earth Economics partnered with Fundacion Neotropica to conduct an economic valuation of the damages, emphasizing ecosystem connectivity and both market and non-market environmental impacts.