Plans for a $2 billion water supply project in northern Colorado will move forward after the communities supporting it agreed to pump $100 million into improving the health of the Cache la Poudre River — a settlement ending decades of dispute over the water infrastructure plans. Leaders from the Northern Integrated Supply Project and the nonprofit environmental group Save the Poudre finalized the settlement on Friday, clearing the way for two new reservoirs. The deal will funnel $100 million over 20 years into a fund to sustain 50 miles of the river from the mouth of the Poudre Canyon, northwest of Fort Collins, to the river’s confluence with the South Platte. The Poudre River Improvement Fund will pay for projects to enhance the river’s flows, water quality, ecosystem and recreational opportunities.