Here's what they sent me:
Sorry this took a while to respond to, it was forwarded to someone that was out sick for a few days. We’re doing a major renovation of Twin Lakes Park we started back in February and we’re looking to finish up in August. The list of what we’re up to is pretty long. You may have noticed that the old culvert crossing across the Lower Clear Creek ditch needed to be removed a year or so ago. We’re replacing that, and also adding a new pedestrian bridge a little further east. The lake edge was eroding pretty badly and starting to crumble off in chunks, so we’re re-grading all of it, and armoring with riprap where that’s appropriate—that’ll help make the lake edge a lot more accessible than it was. The middle “peninsula” area is being raised so that it doesn’t flood anymore. We’re putting in new landscaping, some new picnic shelters and seating, and a new irrigation system (the old one was falling apart). We’re also re-doing some of the trail that was in pretty bad shape, and adding a soft-surface trail around the smaller pond to the south. The old restroom facility is going to be demolished, and we’re replacing it with a port-a-let structure.
We are definitely going to re-fill the lake. We just have to have it mostly de-watered right now so we can work in there. The lake will have the same shape when it’s all done—actually, we had thought of changing it during the planning process but found that water rights issues make it really hard to legally do that. We are planning on distributing excess material—concrete and rock—about the lake bottom to create better fish habitat, and once the project is done I will work with CPW to re-stock the lake and to monitor fish populations going forward. I would like to do something to add deeper spots in the lake for better variety, but it’s tough in spots like these old gravel ponds. The bottom is primarily composed of “wash fines,” a very fine sediment leftover from the gravel mining process, and they just flow like a really wet mud. We’ve found on other projects that we can dig deeper areas, but they fill in pretty quickly due to the nature of the bottom.
I hope that helps, and please feel free to contact me at any time if you have questions or concerns about the project.
Natural Resource Specialist, Parks & Open Space
ADAMS COUNTY, COLORADO