Little Obed Genesis Project
This project began in the fall of 2014. This small stream is one of the three major tributaries that feed the large wetland out of which flows the Little Obed River. It is significantly impacted by stormwater run-off from I-40 which runs parallel with the stream for about 1000 feet before turning away. Because of the stormwater impacts, it was a deeply incised stream in places with vertical and undercut banks up to six feet in height. The downcutting had also exposed a 16 inch diameter high pressure gas line, a significant hazard so close to the interstate. The project had five significant components: remove invasive species from the riparian zone and replace with native plants, replace broken concrete at end of TDOT concrete lined drainageway and install energy dissipation structures, install a grade structure and rock cascade to put the gas line below the bottom of the stream again, remove undercut trees and regrade the undercut and vertical banks, and install cedar revetments with rock toes for bank and channel stabilization.
Recent or Current Projects
This project began in 2013 to respond to extensive bank erosion and sedimentation
which had been noted in a previous survey of the two streams, Byrds Creek and
Three Mile Creek, which make up the two “arms” of the Park. These impairments were caused by two factors:
The Project had four components:
Because the project was conducted in a State Park with the highest level of environmental protection, no heavy equipment was used with the project, relying entirely on human labor, including the carrying of materials to the sites using existing trails. Debris dams were also removed by hand by cutting logs into pieces that could be handled safely.
If each of the treatment areas is considered separately, there were a total of 105 sites, ranging from ten feet in length to eight-four feet long. There was a total of 2,155 feet of banks treated on Three Mile Creek and its main tributary out of a total of 4,028 feet of impacted stream and on Byrds Creek, 523 feet of bank were treated out of 5,500 feet of impacted stream. A total of 507 revetments were installed.
A number of small rock barbs were installed at various points by rearranging existing streambed rocks. Two major vanes and a smaller one were installed at one site on Byrds Creek, using about 5 ¼ tons of local quarried sandstone.
Three debris dams were removed on Three Mile Creek, six debris dams were removed on Byrds Creek.The project was completed in the summer of 2014 with the final planting and removal of some massive logs. On-going monitoring is occurring and some overplanting will occur in spring 2015.
posted 4 minutes ago by Dennis Gregg