BOARD01665

• Board Meeting Date: 3/22/2005
• Description: ISF Section - Table Rock Properties, LLC ‎(Case No. 5-03CW331)‎ - Injury with Mitigation Proposal
• Board Meetings - Doc Type: Memo

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to provide adequate protection within the historic channel, which the Ranch has substantia11y and
permanently enhanced to include increased over-winter holding habitat for biota and increased
habitat diversity. The stream improvement project included measures such as grade control to
eliminate further entrenchment and maintain ri1I1e areas, increased spawning area, and a defined
contiguous thalweg. This channel now has the capacity to support the same aquatic biota at a
lower flows.

The areas of the flood plain where the smaII ponds and reclaimed oxbow channels are located
were disconnected from the main channel many years ago by the construction artificial berms.
This has enhanced channel entrenchment (down cutting) and increased ~irnP.Qt mobilization.
The restoration of these areas, and the re-connection to the main channel of the Creek, has
improved overall channel morphology and greatly expanded the fishery habitat.

The flow-sharing plan will operate principally when flows approach 10 ciS in Rock Creek. The
hydrologic analysis completed by water resoUICe engineers fur this project indicates that in a
nonnal water year, sharing would be needed above Egeria Creek primarily during the months of
June - March and below Egeria Creek during the months of August-September (See Tables 4 and
5; Appendix 111). The reason fur this variation is the large contribution that Egeria Creek adds to
the flows in Rock Creek. The analysis indicates that in all other periods of the year, flows are
adequate to f11Rintain 10 ciS in the channel over the relevant period of record (1984-1999).

Project Description:

The Table Rock Ranch Fishery Improvement Project was based on a professional assessment,
design and p.;!wittiug process. Queen of the River Fisheries Consultants completed a
representative stream assessment of Rack Creek in 2002 that included development of a d..tal1l'se
on channel morphology, flow estimation and R2Cross modeling, trout habitat assessment,
quantitative fisheries data, quantitative aquatic macroinvertebrate data, stream heaIth estimation
based on Biotic Condition indices, review of historic flow information for Rock Creek, and review
of modeled flows of Rock Creek below Egeria Creek through the Ranch.

Resuhs of Pre restoration SamnlinlJ:

Length of cru.nnel-12,OOO'
Channel types-B3-B3a
Bankfull widths-23'-36'
Bankfull mean depths-O.9'-1.2'
BankfuIl1lIlIXimum depths-1.5'-1.8'
WtdthlDepth ratios 19.2-35.5 (suitable trout habitat is approximately 14-18)
Flood prone widths-channelized:30-47
unchannelized: 138'
Entrenchment ratios-cllannelized: 1.55:1.88 (highly to moderately entrenched)
unchanne1ized:3.83 (un-entrenched)
Channel stability rating-Fair
Trout habitat rating-Fair