Project Description
In the 2017 RP/PEA, the Trustees identified and evaluated hydrologic modification as a restoration technique in two preferred restoration alternatives: Alternative 2: Habitat Enhancement and Restoration on Newly Acquired Lands, and Alternative 3: Habitat Enhancement and Restoration on State-Owned Lands. In the interim, the Trustees identified three locations on state-owned land within the Upper Management Area where hydrologic modification would be appropriate to remove damaged culverts and replace them with low water crossings. Specifically, the Trustees identified two locations for the installation of long (~100 feet) low water crossings, and one location for a short (~40 feet) low water crossing. The locations were selected as the Trustees are prioritizing restoration in lands adjacent to lands already acquired. This proposed work has a high likelihood of success due to the presence of an existing road system that facilitates access to much of the area and the substantial experience of ADCNR in successfully implementing hydrologic restoration projects.
The proposed project locations are currently raised roadbeds bisecting dry washes that seasonally flood. The construction of low water crossings will require excavation to return the road back to grade. Culverts with raised roadbeds block the natural water flow, thus preventing the natural transport of water across a flood plain. Unlike culverts, low water crossings are designed to permit more natural flow across the structure during low flow conditions and accommodate overtopping during high flow events.
Parties Implementing Restoration
Alabama Department of Conservation and Natural Resources
DOI Project Representatives
Fish and Wildlife Service