MIRROR POND STEERING COMMITTEE
April 2, 2012
Awbrey Butte Conference Room
Bend City Hall
710 NW Wall Street, Bend
Attendance: Bill Smith, Angela Jacobson, Bruce Ronning, Greg Blackmore
1. Update on ownership / indemnity issues (Bill Smith);
• background on sediment testing completed in the Old Mill river stretch
• background on potential sources of sediment pollutants in Mirror Pond
• establishment of tasks to determine the reasonable likelihood of pollutants in the Mirror Pond sediment
1) review best available City data
2) supplement City data as necessary with additional tests
2. Discussion of BPRD survey results and bond measure plans (Bruce Ronning)
• District has not yet determined whether to pursue a Bond at this time
• If a Bond is pursued,
– it could be placed on the November 2012 ballot
– the District believes that it has the greatest chance of passing if the additional cost per household is less than $50 on average, resulting in less than a $30 million bond
– the District will likely be willing to include a Mirror Pond assessment project if a bond is pursued. The intent of a Mirror Pond assessment project would likely be to determine the best way to protect Mirror Pond. Such a project could include public outreach and education, along with the establishment of a preferred alternative.
3. Update on DSL / USACE 404 (b)(1) Permitting process (Greg Blackmore)
• Regardless of the specific project design, the application for any fill, removal, or relocation of sediment within Mirror Pond will require a number of specific items, reports, and/or elements of documentation.
• An initial breakdown of each of the needed items, in addition to a rough
estimate of time and cost was provided to the committee.
4. Upcoming Mirror Pond Management Board discussion (Group)
• The Committee suggested that it would be useful for BPRD to update the
MPMB on the results of the survey and the potential actions to be taken
by the District.
• The Committee suggested that breakdown of needed items (regardless of
the project) be revised and presented to the MPMB. Guidance should be
sought on whether to pursue any of the items at this time.
The issue of fish passage at Mirror Pond has come up again recently…in short, I do not think that a roughened channel or natural type fishway would work at this site. I am not familiar with the site, so I wouldn’t want to say 100%, but typically these types of solutions only work in cases when the obstruction is less than 5 or 6 feet tall. In the case of Mirror Pond Dam, my information says its around 20 feet tall. Generally at such a large obstruction there is not enough space downstream to effectively provide passage with a roughened channel or another type of “natural” solution. For example, NMFS guidelines for a roughened channel is max 150 feet long, and maximum 6% gradient. That means that even at these maximums, which may not provide very good fish passage, the maximum “height” the roughened channel could be is 9 feet. Couple that with the natural channel gradient in the stream, which on the Deschutes is likely 1-3% (which gives you a drop of 1.5 to 4.5 feet over 150’), then the roughened channel would only be overcoming 4.5 to 7.5 feet of the 20 foot barrier. In addition, typically roughened channels become very unstable at heights above 5 or 6 feet.
If and when stakeholders and interested parties go down the road of developing and implementing fish passage at Mirror Pond, we will have all options on the table, and will investigate all possibilities for passage. The ultimate goal will be to develop a project that meets the needs of the native migratory fish on site, and meets the needs of all the stakeholders at the site.
I appreciate your participation, interest, and questions in this matter, and do feel free to let me know if you have any other questions.
Thank you, and take care.
ODFW-Assistant Fish Passage Coordinator
The Reply to: question-to-odfw-on-natural-type-fishways