HomeMy WebLinkAbout024.01 Appendix Y Agricultural Water User Facilities Memo
Aaker Phase 1 Subdivision
Preliminary Plat Application
22-311 | March 2023
Agricultural Water User Facilities.
This document provides the information required in BMC 38.220.060.A.8.
The Aaker property has 3 water courses running south to north through the property.
The West Fork of Catron Creek, a natural stream, flows through the western portion of
the property. The East Fork of Catron Creek, also a natural stream, runs through the
eastern portion of the property. A Middle Creek Ditch irrigation ditch, a man-made ditch,
flows through the center of the Aaker property. All 3 water courses can be considered
agricultural water facilities.
The Aaker property lies on the southern side of Bozeman, and as such is towards the
downstream end of the agricultural water supply system. There is only one water user
downstream of Aaker, which is the MSU BART Farm. However, the existing water
courses allow unused irrigation water (irrigation wastewater) from upstream to return to
natural water courses and are important to the overall agricultural water system.
The contact for Middle Creek Ditch company is:
Peggy Easton, President
Middle Creek Ditch Company
(406) 587-8328
5100 Patterson Rd
Bozeman, MT 59718
The contact for MSU is:
John How, Associate Vice President of Facilities Management
Montana State University
john.how@montana.edu
(406) 994-2105
Currently MSU receives water flowing down the center irrigation ditch. Once on the
MSU property a large portion of this ditch water is diverted to the West Fork of Catron
Creek, and then pumped out for spray irrigation. A small portion of the water continues
downstream for flood irrigation and stock water.
Only minor changes to the agricultural water user facilities are proposed for Aaker
Phase 1 Subdivision, and there will be no reduction in quality or amount of irrigation
water. Within the Bozeman area the historic network of irrigation ditches presents a
significant flood hazard to developed property. This is because the irrigation ditches
captured flood flows from natural drainages, were routed along high areas to facilitate
flood irrigation, and they were sized to convey only irrigation water and not potential
flood flows. South of the Aaker property the West Fork of Catron Creek drainage basin
has been intercepted and diverted into the center irrigation ditch. The Aaker project is
proposing to install a diversion pipe returning non-irrigation water, irrigation wastewater,
and flood flows back to the West Fork of Catron Creek in the southern portion of the
Aaker property. Prior to the diversion a headgate will be installed allowing MSU
irrigation water to continue downstream in the existing irrigation ditch, but preventing
unused irrigation wastewater and flood flows from continuing north. The only other
alteration is the extension of an existing culvert, with the same size pipe, where Kagy
Boulevard crosses the center irrigation ditch.
The northern portion of the West Fork of Catron Creek will flow through the Phase 1
City Park. The northern portion of the center irrigation ditch is located on Common
Open Space. The remaining water courses will remain as is on the large, restricted lot
south of Kagy.
Stormwater from subdivision improvement is retained on-site, with large event overflows
returning to the two natural streams. No stormwater is discharged into the center
irrigation ditch. All natural stream crossings and the return pipe are sized to convey the
100-year flood flow, which exceeds any irrigation water flow.
Planned alterations have been presented to Middle Creek Ditch Company and MSU
and have initial concurrence. A letter affirming this is provided with the Preliminary Plat
submittal. Formal approval will be obtained prior to Final Plat and easements will be
granted to the Middle Creek Ditch Company with the Final Plat. A 30’ wide easement is
proposed for the return pipe, and a 20’ wide easement is proposed for the center
irrigation ditch. Proposed easements are shown on the Preliminary Plat and subdivision
plan sheets.
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