Outlet: (
Satellite)
Spillway: (
Satellite)
In addition to flood control, the 1977 dam also provides a minimum flow for the Des Moines River. [
USACE]
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DamToDam
"The principal purpose of the Saylorville project is to provide additional storage to supplement the flood control capacity of Lake Red Rock downstream and help reduce flood crests on the Des Moines and Mississippi Rivers." The 3-gate, 22' (6.7m) outlet conduit has a capacity of 21kcfs, and the spillway also has a capacity of 21kcfs.
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USACE, Rock Island District posted
It's #FlashbackFriday and today we take a look at the constrution of the spillway at Saylorville Lake! Authorized by the Flood Control Act of 1958, Saylorville Lake is located on the Des Moines River in central Iowa, just north of the city of Des Moines. Fun fact: At normal pool, Saylorville holds 21.1 billion gallons of water. When Saylorville gets to flood storage pool level, the number jumps to 204.1 billion gallons!! |
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USACE, Rock Island District posted
This photo, dated April 7th of 1967, shows the stilling basin area of the outlet works and spillway. The equipment and vehicles in the foreground show just how big this area is!
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The conservation pool is 836 mean sea level (msl), the spillway is at 884msl, and the full flood pool is 54' (16.5m) higher than conservation at 890msl. The spillway was used during the floods of 1984, 1991 and 1993. [
DamToDam]
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NotesOnIowa
"The floodwaters of 1984 poured in at an astonishing rate of 38,000 cubic feet per second (cfs), testing every aspect of the dam’s design. As water flowed safely through the spillway, erosion carved deep into the Pennsylvanian bedrock below, creating what is now known as the Saylorville Gorge....Improvements followed, including the installation of pneumatic crest gates after the historic floods of 1993. These gates enabled even greater floodwater storage capacity, further solidifying the dam’s role as a guardian of Des Moines and the surrounding areas." |
This project included the Big Creek Remeidal Works. [
USACE_project]
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USACE, Rock Island District posted
This photo, dated 10 April of 1972, shows the construction of the Big Creek Spillway. This spillway allows water to flow into Saylorville Lake from Big Creek. The basin at the bottom is now a popular fishing area.
[Several comments talk about kids using it as a water slide until someone drowned and it was outlawed.] |
The Big Creek Remeidal Works diverts the entire Big Creek flow into Saylorville Lake.
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