We received the following press release from FWP and Northwest Energy this week, and though many of you would be interested. Looking forward to things getting back to the old version of normal on the Madi!
FOR IMMEDIATE RELEASE:
NorthWestern Nearly Done With Hebgen Dam Project; Madison River Basin Water Conditions Hold Steady
Butte, Mont. – October 18, 2017 – September precipitation in the Madison River basin was 264 percent of the 30 -year average. This was a welcome change from July and August which were 44 percent and 63 percent of average, respectively.
As a result of the higher inflow, Hebgen Dam outflow and elevation are slightly higher than normal for this time of year. Currently, outflow is 960 cubic feet per second (cfs) and is expected to remain near this level through the end of the month. Hebgen elevation is 6532.35 feet, which is 2.52 feet below full pool. By month end, the lake is anticipated to draft to about 6532 feet.
The Climate Prediction Center’s forecast for the remainder of October indicates a higher probability for temperatures to be above normal and precipitation to be below normal.
Construction crews completed the installation of the new concrete lining in the Hebgen Dam outlet pipe by the end of September, significantly ahead of schedule. NorthWestern Energy was very happy with the quality of work on the concrete, and all test results show the work is in compliance with specifications.
The first week in October the crews ground and patched any surface irregularities, and installed and welded the steel transition section near the intake. During the second week of October the transition steel was grouted into place and work began on removing the materials in the tailrace used for access, as well as cleaning up the site and demobilizing. NorthWestern plans to transition flows from the spillway back to the intake in the coming weeks.
In 2009, the Federal Energy Regulatory Commission (FERC) required safety repairs to the Hebgen Dam intake, spillway and outlet pipeline to meet current dam-safety standards and reflect advances in earthquake seismology. The approximately $40 million project is expected to be mostly complete by the end of 2017, with some minor non-structural work to be done in 2018.
NorthWestern Energy will hold a celebration of the completion of the Hebgen Dam Rehabilitation Project from 6 to 8 p.m. on Nov. 8, 2017, at the Sportsman’s Lodge in Ennis. Feel free to join us. Please RSVP to Kristen Dawes, Kristen.Dawes@northwestern.com, or by leaving a message at (406) 497-2456.