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Boulder County, Colorado: records in the National Inventory of Dams

Boulder County, Colorado had 103 records in the inventory, 32 of them high hazard, as of October 30, 2026, according to the National Inventory of Dams.

The NID prints the county as Boulder. A count is of records, which include the separate structures recorded with a dam.

Boulder County, Colorado, October 2026

32
High-hazard records
October 2026
2nd of 63 counties the NID names in Colorado; 31.1% of the county’s 103 records. A hazard class is not a risk.
32
High hazard, condition published
October 2026
0 rated Poor or Unsatisfactory.
0
High hazard, condition not published
October 2026
0 not provided to the NID, 0 with no condition assessment in its file.

Records by hazard class

1 more column on a wider screen

The 103 records the NID places in Boulder County, Colorado, by the hazard class the responsible agency assigned, October 2026. A class is the consequence of a failure, not its likelihood.
Hazard classRecords
High32
Significant19
Low52
Undetermined0

Every record in Boulder County

High hazard first, then by Federal ID. Each opens the record’s own page, with every field the NID publishes for it. Names are the NID’s, as printed.

2 more columns on a wider screen

The 103 records the National Inventory of Dams lists in Boulder County, Colorado, with the hazard class and the condition assessment of each, as of October 30, 2026
Federal IDDam nameHazard class
CO00171Button RockHigh
CO00172Clover BasinHigh
CO00173FoothillsHigh
CO00176Left Hand ParkHigh
CO00177Left Hand ValleyHigh
CO00182Pleasant ValleyHigh
CO00213Barker MeadowHigh
CO00214Baseline - EastHigh
CO00215Boulder - NorthHigh
CO00219ErieHigh
CO00223Glacier LakeHigh
CO00227HaydenHigh
CO00230JasperHigh
CO00231KosslerHigh
CO00232Leggett & HillcrestHigh
CO00241Marshall LakeHigh
CO00243Mesa ParkHigh
CO00247Gross DamHigh
CO00249Silver LakeHigh
CO00250Six Mile - MainHigh
CO00256Valmont 'A'High
CO00259WanekaHigh
CO01200Beaver ParkHigh
CO01221Davis No. 1High
CO01226LagermanHigh
CO01775MccallHigh
CO02674Harper LakeHigh
CO02777SuperiorHigh
CO02819Boulder - SouthHigh
CO02820Baseline - NorthwestHigh
CO02857Longmont Wtp Forebay EmbankmentHigh
CO02896Pine BrookHigh
CO00169Allen LakeSignificant
CO00212Albion LakeSignificant
CO00224Goose LakeSignificant
CO00234Los Lagos No. 3Significant
CO00235Louisville No. 1Significant
CO00244Panama No. 1 - EastSignificant
CO00246Prince No. 1Significant
CO00284GaynorSignificant
CO00941Margaret Spurgeon #1Significant
CO01201Brainard LakeSignificant
CO01211Highland #2 (South)Significant
CO01229McintoshSignificant
CO01236Oligarchy #1Significant
CO01773Gold Lake #1Significant
CO02821Panama No. 1 - SouthSignificant
CO02829Highland #2 (North)Significant
CO02831Ish #3 (East Dam)Significant
CO02837Gold Lake #2Significant
CO02838Gold Lake #3Significant
CO00174JoderLow
CO00178Longs Peak #1Low
CO00179Longs Peak #2Low
CO00180Loukonen BrothersLow
CO00185SlindeLow
CO00186TumblesomLow
CO00222Goodhue No. 1Low
CO00225Green Lake No. 2Low
CO00228Island LakeLow
CO00236Marfell Lake No. 1Low
CO00242MesaLow
CO00245Prince No. 1Low
CO00251SkyscraperLow
CO00252St. Joe TailingsLow
CO00253Teller Lake No. 5 - EastLow
CO00257Viele LakeLow
CO00735Branith #1Low
CO00857CrystalLow
CO01202CalkinsLow
CO01204CopelandLow
CO01205DavisLow
CO01206DivideLow
CO01214Steele Brothers #1Low
CO01215Steele Brothers #2Low
CO01220WalkerLow
CO01222Davis No. 2Low
CO01224IndependentLow
CO01228MccaslinLow
CO01735DoddLow
CO01737SwedeLow
CO01778Green Lake No. 1Low
CO01779Green Lake No. 3Low
CO01929Lake IsabelleLow
CO02270Left HandLow
CO02368Silver Spruce #2Low
CO02369Longmont ReservoirLow
CO02373South Boulder Diversion Intake DamLow
CO02776Teller No. 2Low
CO02789Hodgson-HarrisLow
CO02812Lakewood ReservoirLow
CO02822Panama No. 1 - NortheastLow
CO02823Panama No. 1 - NorthwestLow
CO02824Six Mile - NorthwestLow
CO02834Peterson LakeLow
CO02839Beaver Park EastLow
CO02892Teller Lake No. 5 - WestLow
CO03009Sunset LakeLow
CO03014Western Mobile Lake 4Low
CO03048Golden Pond No. 3Low
CO03049HeclaLow
CO03060West LakeLow
CO03062WwtpLow

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The immigration link above is EOIR’s courts, which sit in this state. CBP’s encounters are not by state and will not be: its sectors and field offices are areas of responsibility rather than a geography, and assigning them to states would be a claim the data does not make. Immigration and the border.

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Sources

Compiled automatically from National Inventory of Dams — national CSV by a checked SQL query · Editor: Kian O'Connor · How this site is built

Data retrieved