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Army Corps of Engineers increasing Coralville Lake Reservoir outflow

Water on the Coralville Lake approaching the top of the spillway. (CBS2/FOX28)

The U.S. Army Corps of Engineers is increasing the amount of water released from the Coralville Lake Reservoir.

Starting Wednesday, the Corps will increase the outflow on the Iowa River from a current rate of 10,000 cubic feet per second (CFS) to an anticipated level of 12,000 CFS. This outflow of 12,000 CFS will remain in effect until the Coralville Lake starts to fall more than one foot per day.


“Obviously this is good news with predicted lake elevations dropping below 711 feet and outflows decreasing to less than 13,000 CFS from the dam. No mandatory evacuations are anticipated due to these changes,” said Johnson County Emergency Management Director Dave Wilson.

The City of Iowa City is asking people to stay away from the following areas:

  • Lower City Park, 200 Park Road
  • CRANDIC Park, 51 Rock Shore Dr.
  • Trail access under Interstate 80, near Waterworks Prairie Park
  • Trail access near Hills Bank on Gilbert Street
  • Iowa River Trail near McCollister Blvd. and Terry Trueblood Recreation Area
  • Iowa River Trail, Hwy 6 underpass just south of Riverfront Crossings Park
  • Iowa River Trail, behind Kelly Auto/DQ
  • Iowa River Trail, eastside of Benton Street
  • Iowa River Trail behind Ashton House, from curve at Rocky Shore to Normandy drives
  • Iowa River Trail north of Napoleon Ballfields at Rail Road Bridge

The following secondary roads are closed in Johnson County:

  • 140th Street west of Ely Road, at Lakeview OHV Park
  • Sandy Beach at the beach
  • Amana Road between Blain Cemetery and Greencastle Avenue
  • Greencastle Avenue Level B, south of Amana Road
  • Greencastle Avenue Level B, north of Swan Lake
  • Swan Lake Road Level B, west of Half Moon Avenue
  • Cosgrove Road south of Black Diamond Road at Old Man’s Creek
  • Izaak Walton Road east of S&G Sand Plant including Ocean, Driftwood and Camino Del Rio Roads
  • Sand Road south of 560th Street
  • Sand Road north of Highway 22
  • River Junction Road south of River Junction
  • Tri County Bridge Road south of 670th Street
  • Y Avenue south of Tri County Bridge Road
  • Lola Lane
  • Chambers Avenue south of 140th Street to Amana Road
  • Hoosier Creek Road west of Ely Road at Naples Avenue
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