Spence

Spence is an earth dam located in Archuleta County, Colorado, built in 1965. It carries a Significant hazard potential classification and has a fair condition assessment.

About Spence

The primary purpose of Spence is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Alpine Lakes Ranch Ditch Co. (smith, Ron) (private). It impounds the Spence Creek near Dulce, Nm.

The dam stands 58 feet tall and stretches 915 feet across, creates a reservoir covering 32 acres, has a maximum storage capacity of 617 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1965, the structure is well into its service life at over 50 years old.

This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 09/27/2022.

At 58 feet, this dam is taller than 95% of all dams in the United States.

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Significant HazardFair ConditionEmergency Action Plan: Yes

Location

StateColorado
CountyArchuleta
Nearest CityDulce, Nm
River/StreamSpence Creek
Coordinates37.11286, -106.86295

Physical Characteristics

Dam TypeEarth
NID Height58 ft
Dam Height44 ft
Dam Length915 ft
Year Completed1965 (61 years old)

Storage & Hydraulics

NID Storage617 acre-ft
Max Storage617 acre-ft
Normal Storage425 acre-ft
Surface Area32 acres
Drainage Area2 sq mi
Max Discharge4,243 cfs
Spillway TypeUncontrolled

Ownership & Safety

PurposeIrrigation
OwnerALPINE LAKES RANCH DITCH CO. (SMITH, RON)
Owner TypePrivate
Hazard ClassificationSignificant
Condition AssessmentFair
Last Inspection09/27/2022
Emergency Action PlanYes

Identifiers

NID IDCO01056
Federal IDCO01056
More InfoState Dam Safety Program

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