City Council hears plan to control erosion at Nine Mile Creek
The Bloomington City Council received an informational presentation Wednesday on strategies to address severe erosion problems along Nine Mile Creek, particularly in Moir and Central Park. The presentation outlined a comprehensive renewal project designed to stabilize eroding banks and prevent future damage to parks and infrastructure.
The Nine Mile Creek Corridor faces significant erosion challenges that threaten both the stream ecosystem and nearby park paths and infrastructure. The erosion is particularly severe in Moir and Central Park, where steep slopes and the creek's natural meandering patterns have created unstable conditions. City officials presented an overview of the Nine Mile Creek Corridor Renewal Project, which aims to identify problem areas and implement solutions to address the ongoing damage.
Addressing stream erosion is complex and requires multiple approaches, according to the presentation. Initial work involves physically repairing existing erosion damage through careful excavation and bank rebuilding using rock and fabric materials. A key long-term strategy is repositioning infrastructure and creating buffer space to allow the creek to follow its natural meander patterns, which reduces future conflicts between the stream and nearby structures.
The city is considering a range of solutions tailored to different problem areas. These include rebuilding slopes, monitoring vulnerable sections, adding new infrastructure, and planting vegetation whose root systems help stabilize banks. Officials emphasized the importance of coordinating these erosion control efforts with other renewal projects, such as vegetation management and wetland restoration, to maximize their effectiveness.
City leaders stressed the need for proactive investment now to prevent erosion problems from worsening in the future. "We wanna make sure that we are putting the investment in now to ensure that some of those areas that have bad erosion don't continue into the future," a speaker said during the presentation. No official votes were taken during Wednesday's meeting, as this was an informational presentation on an ongoing project. The council did not announce specific funding amounts or timelines for implementation.
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Nine Mile Creek Corridor Erosion Management Strategy Overview
This item provided an overview of the ongoing challenges of stream and gully erosion within the Nine Mile Creek Valley, specifically noting impacts in Moir and Central Park. The speaker outlined the complexity of fixing existing erosion, emphasizing the need for physical remediation (digging out, rebuilding banks with rock/fabric) and strategic planning, such as repositioning infrastructure to allow for natural stream meanders. A range of solutions for the Nine Mile Creek Corridor Renewal Project were discussed, including slope rebuilding, adding new infrastructure, and promoting new vegetation to stabilize slopes. The presentation stressed the importance of proactive investment and coordinated efforts with other renewal projects (e.g., vegetation management, wetland restoration) to maximize the impact of erosion control measures.
The fix for these sort of erosion problems on a stream is pretty complicated. One, you have to go in and fix the erosion that's already occurred, so you do some digging out and make sure that you're not creating the problem worse.
because you wanna give that stream some space so it can have its natural meander curve come back. And we don't run into this problem in the future where that conflict happens.
It could be rebuilding the slope, it could be just keeping an eye on things, it could be adding new infrastructure. There's a lot of old infrastructure that's already through the parks, or it could be as simple as just adding new vegetation and all those roots really holding the slope together.
We wanna make sure that we are putting the investment in now to ensure that some of those areas that have bad erosion don't continue into the future, and that we're doing this work in coordination with a lot of the other projects that are happening with the renewal project.
Source document
[0:00] (gentle music)
[0:01] - Erosion is a natural
part of any stream system.
[0:04] As streams meander, they're
constantly depositing sediment
[0:07] and eroding sediment in other places.
[0:09] In some instances, we do have areas
[0:12] that the erosion's getting too bad,
[0:14] and this is one of those cases.
[0:16] We have a large cut bank on
an outer edge of the stream,
[0:19] and as this sediment is eroded,
one, it enters the stream.
[0:23] That's not great for the stream ecosystem,
[0:25] if it's too high of a sediment load.
[0:27] And then two, as this erodes,
[0:29] it's gonna start creeping upland.
[0:31] And in this case, we have a path
[0:33] on the upland side of things.
[0:34] And as that erosion continues to happen,
[0:37] it starts to impact and conflict
[0:39] with the position of that path.
[0:41] The fix for these sort of erosion problems
[0:43] on a stream is pretty complicated.
[0:45] One, you have to go in and fix the erosion
[0:48] that's already occurred,
so you do some digging out
[0:50] and make sure that you're not
creating the problem worse.
[0:53] So, we do a lot of that
work in the winter,
[0:55] and then you have to stabilize it
[0:56] so you rebuild the stream bank
[0:58] to have either some rock bottoms
[1:01] or some fabric that
helps stabilize things.
[1:04] And in some instances, when
you have such a small area
[1:07] from the infrastructure that's up there,
[1:10] in this case, a path to the stream,
[1:12] it could make sense to kind of
[1:13] scoot the infrastructure
over a little bit,
[1:15] because you wanna give
that stream some space
[1:17] so it can have its natural
meander curve come back.
[1:19] And we don't run into
this problem in the future
[1:21] where that conflict happens.
[1:24] Because Moir and Central Park are located
[1:26] in the Nine Mile Creek Valley,
[1:28] there are a lot of steep slopes
[1:30] and steep slopes are prone to erosion.
[1:32] It's not necessarily bad
[1:33] that there's some erosion here and there.
[1:35] That's a natural process.
[1:37] But in some areas, this
erosion's become a problem.
[1:40] And so, as part of the Nine Mile Creek
[1:42] Corridor Renewal Project,
[1:44] we want to find those problematic areas
[1:47] and we come up with a fix.
[1:49] It could be rebuilding the slope,
[1:51] it could be just keeping an eye on things,
[1:53] it could be adding new infrastructure.
[1:56] There's a lot of old infrastructure
[1:57] that's already through the parks,
[1:58] or it could be as simple as
just adding new vegetation
[2:01] and all those roots really
holding the slope together.
[2:04] Another big issue with erosion
[2:06] in the valley system is gullies,
[2:08] and that's where the land kind of creates
[2:10] that V shape and funnels
water down through it.
[2:13] Because it has a lot more flowing water,
[2:15] it gets these big head
cuts that start to form,
[2:18] and that's where the water
starts to kind of waterfall
[2:20] and that starts to cut upstream.
[2:22] So, what we wanna do is we
wanna find these gullies.
[2:26] We wanna make sure that
they aren't experiencing
[2:28] these significant erosion occurrences,
[2:30] and if they are, whether or not
[2:32] we need to fix them and how to fix them.
[2:35] Erosion and slope management,
[2:37] it's not particularly glamorous,
[2:39] but it's a really important component
[2:41] of managing the lower creek corridor.
[2:44] We wanna make sure that we are
putting the investment in now
[2:47] to ensure that some of those
areas that have bad erosion
[2:51] don't continue into the future,
[2:52] and that we're doing
this work in coordination
[2:56] with a lot of the other projects
[2:57] that are happening with
the renewal project.
[2:59] And that could be vegetation management,
[3:01] wetland restoration,
and stream management.
[3:04] Doing those things together
[3:06] really helps maximize the
impact of our efforts.
[3:10] (gentle music)
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