Coralville Lake Reservoir MET Station
| Property | Value |
|---|---|
| id | 17017 |
| provider | MVR |
| code | CRVI4 |
| slug | crvi4 |
| elevation | 645.0 |
| horizontal_datum | |
| vertical_datum | NGVD29 |
| state | IA |
| kind | PROJECT |
| nearest_city | Coralville |
| public_name | Coralville Lake Reservoir MET Station |
| location_code | 17017 |
| nsid | None |
| aliases |
NIDID:
IA00012
USGS Station Number: 05453510 CWMS Legacy Naming: CRVI4 CWMS Standard Naming: CRVI4 |
| timeseries |
tsid:
CRVI4.Temp-Air.Inst.30Minutes.0.rev
label: Air Temperature base_parameter: Temp parameter: Temp-Air unit: F unit_long_name: Fahrenheit latest_time: 2026-05-20T00:00:00Z latest_value: 55.54 delta24h: None sort_order: 22 results: None tsid: CRVI4.Stor.Inst.30Minutes.0.rev label: Flood Storage base_parameter: Stor parameter: Stor unit: ac-ft unit_long_name: Acre-feet latest_time: 2026-05-20T00:00:00Z latest_value: 30047.25 delta24h: None sort_order: 11 results: None tsid: CRVI4.Elev-Pool.Inst.30Minutes.0.rev label: Elevation base_parameter: Elev parameter: Elev-Pool unit: ft unit_long_name: Feet latest_time: 2026-05-20T00:00:00Z latest_value: 684.18 delta24h: None sort_order: 1 results: None tsid: CRVI4.Dir-Wind.Inst.30Minutes.0.rev label: Wind Direction base_parameter: Dir parameter: Dir-Wind unit: deg unit_long_name: Degrees latest_time: 2026-05-20T00:00:00Z latest_value: 308.0 delta24h: None sort_order: 23 results: None tsid: CRVI4.Elev-Tail.Inst.30Minutes.0.rev label: Elevation Tailwater base_parameter: Elev parameter: Elev-Tail unit: ft unit_long_name: Feet latest_time: 2026-05-20T00:00:00Z latest_value: 651.6 delta24h: None sort_order: 3 results: None tsid: CRVI4.Flow-In.Inst.30Minutes.0.smoothed label: Inflow base_parameter: Flow parameter: Flow-In unit: cfs unit_long_name: Cubic feet per second latest_time: 2026-05-19T21:00:00Z latest_value: 2116.77 delta24h: None sort_order: 6 results: None tsid: CTWI4.Flow.Inst.30Minutes.0.rev label: Outflow base_parameter: Flow parameter: Flow unit: cfs unit_long_name: Cubic feet per second latest_time: 2026-05-20T00:00:00Z latest_value: 3177.79 delta24h: None sort_order: 7 results: None tsid: CRVI4.Precip.Inst.30Minutes.0.rev label: Precipitation base_parameter: Precip parameter: Precip unit: in unit_long_name: Inches latest_time: 2026-05-20T00:00:00Z latest_value: 69.63 delta24h: None sort_order: 16 results: None tsid: CRVI4.Stor.Inst.30Minutes.0.rev label: Conservation Storage base_parameter: Stor parameter: Stor unit: ac-ft unit_long_name: Acre-feet latest_time: 2026-05-20T00:00:00Z latest_value: 30047.25 delta24h: None sort_order: 13 results: None |
| name | Coralville Lake Reservoir MET Station |
| hasResopsAverages | true |
| nidId | IA00012 |
| nidid | |
| levels |
slug:
elev.tempsl
label: TempSL parameter: Elev-Pool base_parameter: Elev tsid: CRVI4.Elev-Pool.Const.0.TempSL latest_value: 683 units: ft units_long_name: Feet slug: elev.top of conservation label: Top of Conservation parameter: Elev-Pool base_parameter: Elev tsid: CRVI4.Elev-Pool.Const.0.Top of Conservation latest_value: 683 units: ft units_long_name: Feet slug: elev.top of exclusive flood control label: Top of Exclusive Flood Control parameter: Elev-Pool base_parameter: Elev tsid: CRVI4.Elev-Pool.Const.0.Top of Exclusive Flood Control latest_value: 712 units: ft units_long_name: Feet slug: elev.streambed label: Streambed parameter: Elev-Pool base_parameter: Elev tsid: CRVI4.Elev-Pool.Inst.0.Streambed latest_value: 646 units: ft units_long_name: Feet slug: elev.top of conservation label: Top of Conservation parameter: Elev-Pool base_parameter: Elev tsid: CRVI4.Elev-Pool.Inst.0.Top of Conservation latest_value: 683 units: ft units_long_name: Feet slug: elev.top of dam label: Top of Dam parameter: Elev-Pool base_parameter: Elev tsid: CRVI4.Elev-Pool.Inst.0.Top of Dam latest_value: 743 units: ft units_long_name: Feet slug: elev.top of flood label: Top of Flood parameter: Elev-Pool base_parameter: Elev tsid: CRVI4.Elev-Pool.Inst.0.Top of Flood latest_value: 712 units: ft units_long_name: Feet slug: stor.top of conservation label: Top of Conservation parameter: Stor base_parameter: Stor tsid: CRVI4.Stor.Inst.0.Top of Conservation latest_value: 28070 units: ac-ft units_long_name: Acre-feet slug: stor.top of flood label: Top of Flood parameter: Stor base_parameter: Stor tsid: CRVI4.Stor.Inst.0.Top of Flood latest_value: 420960 units: ac-ft units_long_name: Acre-feet |
| id | 549868 |
| associatedStructuresCount | 1 |
| conditionAssessDate | None |
| conditionAssessDetail | None |
| conditionAssessId | 6 |
| damHeight | 100 |
| damLength | 1400 |
| distance | None |
| drainageArea | 3115 |
| eapId | 1 |
| dsacAssignedDate | 2019-04-25T12:00:00.000Z |
| eapMeetsGuidelinesId | 1 |
| emergencyContactsUpdated | 2024-05-28T12:00:00.000Z |
| eapLastRevDate | 2020-06-01T12:00:00.000Z |
| enforcementAuthorityId | 0 |
| federalId | IA00012 |
| oldFederalId | IA00012 |
| hazardId | 4 |
| hydraulicHeight | 93 |
| inspectionAuthorityId | 0 |
| inspectionDate | 2023-12-06T12:00:00.000Z |
| inspectionFrequency | 1 |
| jurisdictionAuthorityId | 0 |
| latitude | 41.724478155 |
| lengthOfLocks | 0 |
| secondaryLengthOfLocks | None |
| longitude | -91.5297752069999 |
| maxDischarge | 244000 |
| maxStorage | 420960 |
| nidHeight | 132 |
| nidStorage | 420960 |
| normalStorage | 28100 |
| numberOfLocks | 0 |
| operationalStatusDate | 2019-04-25T12:00:00.000Z |
| operationalStatusId | 1 |
| originalDesignerName | None |
| otherStructureId | None |
| permittingAuthorityId | 0 |
| politicalPartyId | None |
| privateDamId | None |
| projectDescription | The U.S. Army Corps of Engineers (USACE) completed construction of Coralville Dam in June 1957 for the purpose of flood risk management, recreation, and fish and wildlife management. Coralville Dam is located on the Iowa River about 4 miles north of Iowa City, Iowa. The earthen dam is over about a quarter mile long with a maximum height of 96 feet. Water can be released from the lake in two ways. The first is through the gated outlet structure, which consists of a gate tower, a 23-feet-diameter reinforced concrete conduit, and a stilling basin, which helps slow down water as it is released from the lake. The second is through an emergency spillway located on the west side of the dam. The spillway structure consists of a concrete barrier wall with a concrete lined chute and side walls. The spillway allows water to flow over the top of the barrier wall during extremely high lake levels. The spillway structure transitions into a natural ground spillway that empties into the Iowa River approximately a quarter mile downstream of the dam. Coralville Dam has prevented over $700 million in flood damages and protects more than 23,000 people living and working in the area below the dam. The highest lake elevation observed was in 2008 and was just over 5 feet higher than the crest of the emergency spillway. Water has reached the spillway only two times, in 1993 and 2008. The 2008 event released the record amount of water through the dam at 39,500 cubic feet per second, approximately 16% of the design capacity. |
| riskCharSummary | USACE completed a risk assessment in May 2014 and classified the risk associated with Coralville Dam as low. Water released from the dam could impact densely populated sections of Iowa City and Coralville, Iowa, to include the University of Iowa, with little warning time in the extremely unlikely event of a dam failure. The dam was found to be well-designed, well-constructed, and well-maintained and is expected to be reliable during major floods. However, there is a very remote risk of dam failure from a failure of the spillway slabs and training walls leading to erosion of the dam embankment. Although highly unlikely, a dam failure would produce a devastating flood with flood depths greater than 15 feet through downtown Iowa City and Coralville. The flood would inundate portions of Iowa City and Coralville along the Iowa River and the small towns and rural communities downstream along the Iowa River. Approximately 23,000 people live or work within the worst-case inundation area of the flooding caused by a dam failure. |
| riskManagementMeasures | USACE works to reduce the risks posed to the community by Coralville Dam. The dam’s Emergency Action Plan is updated regularly, and the emergency notification charts are updated annually. This plan has been coordinated with state and local Emergency Management Agencies to help improve their dam incident response planning and preparedness responsibilities. Emergency exercises are routinely held with local and state emergency responders and stakeholders to enhance the local communities’ response plan and evacuation procedures. Dam breach flood maps are available for public viewing on the National Inventory of Dams. USACE is developing a detailed communication plan based on the latest risk assessment findings and will engage in communication activities with state and local representatives, stakeholders, emergency managers, and the general public to increase awareness. The dam has a robust instrumentation and monitoring program that allows USACE staff to regularly monitor the dam’s performance under changing lake levels. USACE operations and engineering staff routinely conducts detailed inspections of the dam during both normal and high lake levels to ensure the integrity of the dam, identify deficiencies, and monitor known deficiencies. The dam is well maintained through continuous operations and regular maintenance activities. Lastly, the Iowa River Master Reservoir Regulation Manual, Water Control Manual for Coralville Lake is coordinated with upstream and downstream stakeholders, to allow the lake to be better managed in terms of earlier reservoir releases ahead of increasing lake levels in an effort to prevent emergency spillway releases. |
| riverName | IOWA RIVER |
| separateStructuresCount | 1 |
| sourceAgency | US Army Corps of Engineers |
| spillwayTypeId | 3 |
| spillwayWidth | 500 |
| stateFedId | IA00012 |
| stateRegulatoryAgency | None |
| stateRegulatedId | 0 |
| structuralHeight | 132 |
| submitDate | 2023-02-16T17:25:28.076Z |
| surfaceArea | 4050 |
| volume | 1212835 |
| widthOfLocks | 0 |
| secondaryWidthOfLocks | None |
| yearCompleted | 1958 |
| congDist | Congressional District 01, Iowa |
| city | IOWA CITY |
| county | Johnson |
| aiannh | None |
| websiteUrl | https://www.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/Article/2870967/dam-safety-program/ |
| coreTypeIds | 3 |
| damTypeIds | 9;8 |
| fedConstructionIds | 1 |
| fedDesignIds | 1 |
| fedFundingIds | 1 |
| fedInspectionIds | 1 |
| fedOperationIds | 1 |
| fedOtherIds | 1 |
| fedOwnerIds | 1 |
| fedRegulatoryIds | 1 |
| formerNames | None |
| foundationTypeIds | 1;3 |
| nonFederalDamOnFederalId | 0 |
| designerNames | CEMVR |
| otherNames | Coralville Lake |
| ownerNames | USACE - Rock Island District |
| ownerTypeIds | 3 |
| primaryDamTypeId | 9 |
| primaryOwnerTypeId | 3 |
| primaryPurposeId | 9 |
| purposeIds | 9;5 |
| dsacId | 4 |
| femaRegion | 7 |
| lastEapExcerDate | 2021-10-05T12:00:00.000Z |
| dataUpdated | 2025-05-21T12:00:00.000Z |
| usaceDistrict | Rock Island District |
| noConsequencesId | 0 |
| secretaryAgricultureBuiltId | None |
| nrcsWatershedAuthorizationId | None |
| isAssociatedStructureId | No |
| fedRegulatedId | Yes |
| inundationNidAddedId | 1 |
| damStatusId | 2 |
| huc06 | 070802 |
| doi_region | None |
| doi_region_name | Mississippi Basin |
| doi_region_number | 4 |
| thirtyYearAverage | 99.1784 |
| tenthPercentile | 32.2848 |
| ninetiethPercentile | 234.2898 |
| Links |
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