Minneapolis Park and Recreation Board

Parks, Minneapolis Public Schools, Density, Zoning, etc.
is great.
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Re: Minneapolis Park and Recreation Board

Postby MNdible » February 22nd, 2021, 1:36 pm

The Barr engineering report said that the limiting factor for the level of the lake is either the gas pipes just below 28th Ave or a rock weir (some rocks along the bank and across the creek, placed at an unknown time) under the 31st Ave footbridge.
OK, but on the scale of the changes that we're talking about here, it seems like both burying the gas lines deeper and removing a rock weir are things that ought to at least be on the table, since both of them are presumably man-made obstructions changing the hydrology in this area.

City Center
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Re: Minneapolis Park and Recreation Board

Postby Scottie » February 22nd, 2021, 1:47 pm

The Park Board claims 19 downstream obstructions in the firs 2,200 hundred feet of the creek past the course including a 10ft regional sewer interceptor on their website. Not sure how seriously they looked at the practicality of moving them though.

https://www.minneapolisparks.org/projec ... -dredging/

Capella Tower
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Re: Minneapolis Park and Recreation Board

Postby EOst » February 22nd, 2021, 1:53 pm

I was under the impression that the water on the golf course was primarily a groundwater inflow issue (because lakes here are just areas where the ground level dips below the water table), and not an issue of insufficient outlet. The Barr report concluded that "the potential lowering of Lake Hiawatha control would result in a water surface of 811.8 ft NGVD29, which is approximately one (1) foot lower than that the OHWL," which isn't enough to make a difference for the course, but would "require excavation of approximately 2,000 feet of creek channel, replacement/lowering of utility crossings under the creek bed, and the associated permitting for these activities."

Blaisdell Greenway
Nicollet Mall
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Re: Minneapolis Park and Recreation Board

Postby Blaisdell Greenway » February 23rd, 2021, 9:47 am

It's both (outlet + groundwater) because the course is towards the end of the Minnehaha Creek watershed. Upstream impacts in Minnetonka, SLP, Edina, Minneapolis (more hardscape, runoff, and so on) start to manifest in south Minneapolis. Not just the park/golf course but also flooded basements in Nokomis, overflow for Mother Lake and nearby environs, etc.

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