Little Deschutes River

Conservation Measure CC – 1: Crescent Creek Flow Management* Responsible Permittee: [TID] Species Affected: Oregon spotted frog During the term of the DBHCP the storage volumes shown in Table CC-1 shall be made available for Oregon spotted frog conservation in Crescent Creek. The volumes in Table CC-1 include Crescent Creek instream and storage rights for fish and wildlife use that have already been created through TID conserved water projects, as well as water rights that will result from future TID conserved water projects. The volume of water available each year shall be determined on July 1 based on total storage volume in Crescent Lake Reservoir on that date. This water will be available for release over the subsequent (first) water year (October 1 – September 30), after coordination with USFWS and ODFW to maximize benefits to fish and wildlife, and may not be carried over in whole or in part into the second water year. The rate of release of this stored water from Crescent Lake Reservoir may be adjusted up to two times per month. A portion of the water shall be used each year to maintain the storage season minimum instream flows specified in Table CC 2. The remaining water may be used to: a) increase the storage season minimum flows above the levels specified in Table CC-2, b) increase instream flow prior to the ramping up of irrigation releases from Crescent Lake Reservoir in late spring or early summer, or c) delay the ramping down of irrigation releases from the reservoir at the end of the irrigation season. If TID conserved water projects result in Crescent Creek rights for fish and wildlife use that exceed the amounts specified in Table CC-1 for the respective years of DBHCP implementation, the higher storage rights will become the requirement under this conservation measure when the conservation projects are complete. The flow at CREO may be less than the minimums specified in Table CC-2 during gate tests, gallery/conduit inspections, dam maintenance, and minor repairs. Flow changes to accommodate these actions will be done in coordination with USFWS. * Gate tests and gallery/conduit inspections will be conducted between October 1 and November 31 and will last no more than 8 hours each. During gate tests and gallery/conduit inspections TID will utilize the existing bypass (estimated to be 5 cfs) to maintain a flow downstream of the dam. * Maintenance involving removal of rock from the ramp flume will not cause cessation of flows for more than 2 hours. The timing of these maintenance activities will be coordinated in advance with USFWS. * Minor repairs will not result in complete cessation of flows for more than 4 hours, flows below 10 cfs for more than 8 consecutive hours, or flows of less than 10 cfs for more than 24 hours cumulatively in a one-week period. The timing of minor repairs will be coordinated in advance with USFWS. *USFWS is not a water manager. All references here and elsewhere in this DBHCP regarding USFWS involvement in water management decisions are intended to define where USFWS technical assistance will be sought to remain in compliance with the Conservation Measures. Table CC-1. Volumes of storage in Crescent Lake Reservoir to be made available for Oregon spotted frog conservation under the DBHCP. ────────────────────────────────────────────────────────┬───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── │Volume of Crescent Lake Reservoir Storage (acre-feet) to be Available for Oregon Spotted Frog Conservation^{1,2} ────────────────────────────────────────────────────────┼─────────────────────────────────────────────────────────┬─────────────────────────────────────────────────────────────────┬───────────────────────────────────────────────────────── DBHCP Implementation Years │When Total Storage Volume² on July 1 is <45,000 acre-feet│When Total Storage Volume² on July 1 is 45,000 – 75,000 acre-feet│When Total Storage Volume³ on July 1 is >75,000 acre-feet ────────────────────────────────────────────────────────┼─────────────────────────────────────────────────────────┼─────────────────────────────────────────────────────────────────┼───────────────────────────────────────────────────────── 1-10 │5,264 │7,264 │8,764 ────────────────────────────────────────────────────────┼─────────────────────────────────────────────────────────┼─────────────────────────────────────────────────────────────────┼───────────────────────────────────────────────────────── 11-15 │6,464 │8,464 │9,964 ────────────────────────────────────────────────────────┼─────────────────────────────────────────────────────────┼─────────────────────────────────────────────────────────────────┼───────────────────────────────────────────────────────── 16-20 │7,664 │9,664 │11,164 ────────────────────────────────────────────────────────┼─────────────────────────────────────────────────────────┼─────────────────────────────────────────────────────────────────┼───────────────────────────────────────────────────────── 21-30 │8,864 │10,864 │12,364 ────────────────────────────────────────────────────────┴─────────────────────────────────────────────────────────┴─────────────────────────────────────────────────────────────────┴───────────────────────────────────────────────────────── 1 Total volume of water available for Oregon spotted frog conservation under this measure includes, and is not in addition to, Crescent Lake Reservoir storage allocated for fish and wildlife use under Oregon water law. ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── 2 The water made available each year can only be used during the subsequent (first) water year, and may not be carried over in whole or in part into the second water year. ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── 3 Total storage volume will be measured at [Hydromet Station CRE] ([OWRD Gage 14059500]) as the 3-day average for June 29 – July 1 to reduce the effects of wind-induced fluctuations in storage volume readings at the gage. ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── Table CC-2. Minimum flows at [Hydromet Station CREO] ([OWRD Gage 1406000]) under the DBHCP. ─────────────────────────────────────────────────┬───────────────────────────────────────────────────┬──────────────────────────────────────────────────────── DBHCP Implementation Years │Storage Season Minimum Flow (cfs)¹ (Oct 1 – Jun 30)│Irrigation Season Minimum Flow (cfs)^{2,3} (Jul 1 – Sep │ │30) ─────────────────────────────────────────────────┼───────────────────────────────────────────────────┼──────────────────────────────────────────────────────── 1-10 │10 (±1) cfs │50 (±5) cfs ─────────────────────────────────────────────────┼───────────────────────────────────────────────────┼──────────────────────────────────────────────────────── 11-15 │10 (±1) cfs │50 (±5) cfs ─────────────────────────────────────────────────┼───────────────────────────────────────────────────┼──────────────────────────────────────────────────────── 16-20 │11 (±1) cfs │50 (±5) cfs ─────────────────────────────────────────────────┼───────────────────────────────────────────────────┼──────────────────────────────────────────────────────── 21-30 │12 (±1) cfs │50 (±5) cfs ─────────────────────────────────────────────────┴───────────────────────────────────────────────────┴──────────────────────────────────────────────────────── 1 Allowances of ± 1 cfs are for compliance purposes to allow for inaccuracies in gage measurements and limitations in the precision of dam operation. ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── 2 Allowances of ± 5 cfs are for compliance purposes to allow for inaccuracies in gage measurements and limitations in the precision of dam operation. ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── 3 Instream flow may be less than 50 cfs if low storage volume in Crescent Lake Reservoir makes passive release of water impossible. ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── Conservation Measure CC – 2: Crescent Dam Ramping Rates Tumalo Irrigation District will not increase in the flow below Crescent Dam (as measured at [OWRD Gage 14060000]) more than 30 (±2) cfs per 24‑hour period or decrease the flow more than 20 (±2) cfs per 48‑hour period, except under emergency conditions. Conservation Measure CC – 3: Crescent Lake Reservoir Irrigation Release Season Annual transition from irrigation season flows (≥ 50 cfs) to storage season flows (≥ 10 cfs) at [Hydromet Station CREO] below Crescent Dam will end no later than October 31 of each year. The Little Deschutes River is also affected by UD-1, a conservation measure that is not dependent on stream gauging. Please see [DESCHUTES BASIN HCP: Conservation Measures & Monitoring Requirements] for more information.