Basalts and tuffs in the area around the dam.

Owyhee Dam (National ID # OR00582) is a concrete arch-gravity dam on the Owyhee River in Eastern Oregon near Adrian, Oregon, United States. Completed in 1932 during the Great Depression, the dam generates electricity and provides irrigation water for several irrigation districts in Oregon and neighbouring Idaho. At the time of completion, it was the tallest dam of its type in the world (it was surpassed about two years later). The dam is part of the Owyhee Dam Historic District, which is listed on the National Register of Historic Places.

The dam impounds the river to create the Owyhee Reservoir, with storage capacity of nearly 1,200,000 acre-feet (1.5 km3) of water. The more than 400-foot (120 m) tall concrete-arch gravity dam is owned by the United States Bureau of Reclamation (USBR) and operated by the Owyhee Irrigation District. Haystack Rock Road is carried over the 833-foot (254 m) long crest of the dam.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

ⓘ Analcime

ⓘ 'Apophyllite Group'

ⓘ 'Heulandite Subgroup'

ⓘ Offretite

ⓘ Opal

ⓘ Pentagonite (TL)

ⓘ Stilbite-Ca

8 valid minerals. 2 (TL) - type locality of valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

ⓘ Basalt

ⓘ Tuff

Detailed Mineral List:

ⓘ Analcime

Formula: Na(AlSi₂O₆) · H₂O

Habit: trapazhedra to 2mm in diameter

Colour: water-clear, transperent

References:

Staples, Lloyd W., Evans, Howard T., Lindsay, and James R. (1973) Cavansite and pentagonite, new dimorphous calcium vanadium silicate minerals from Oregon. American Mineralogist, 58 (5-6) 405-411

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

ⓘ 'Apophyllite Group'

Formula: AB₄[Si₈O₂₂]X · 8H₂O

References:

ⓘ Calcite

Formula: CaCO₃

References:

ⓘ Cavansite (TL)

Formula: Ca(VO)Si₄O₁₀ · 4H₂O

Type Locality:

References:

Staples, L.W., Evans, H.T Jr., Lindsay, J.R. (1967) Cavansite, a new calcium vanadium silicate mineral (abstr.). Geological Society of America, Program Annual Meeting: 211-212.

ⓘ 'Chabazite'

References:

Betts, John (n.d.) John Betts website listing.

ⓘ Gmelinite-Ca

Formula: Ca₂(Si₈Al₄O₂₄] · 11H₂O

References:

ⓘ 'Heulandite Subgroup'

Formula: (Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O

References:

ⓘ Offretite

Formula: KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O

References:

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

ⓘ Opal

Formula: SiO₂ · nH₂O

ⓘ Pentagonite (TL)

Formula: Ca(VO)Si₄O₁₀ · 4H₂O

Type Locality:

References:

Evans, Howard T., Jr. (1973) The crystal structures of cavansite and pentagonite. American Mineralogist, 58 (5-6) 412-424

ⓘ Stilbite-Ca

Formula: NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O

References:

Gallery:

AB₄[Si₈O₂₂]X · 8H₂Oⓘ 'Apophyllite Group'

Ca(VO)Si₄O₁₀ · 4H₂Oⓘ Cavansite (TL)

SiO₂ · nH₂Oⓘ Opal

Ca(VO)Si₄O₁₀ · 4H₂Oⓘ Pentagonite (TL)

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Opal	4.DA.10	SiO₂ · nH₂O
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
Group 9 - Silicates
ⓘ	Cavansite (TL)	9.EA.50	Ca(VO)Si₄O₁₀ · 4H₂O
ⓘ	Pentagonite (TL)	9.EA.55	Ca(VO)Si₄O₁₀ · 4H₂O
ⓘ	Analcime	9.GB.05	Na(AlSi₂O₆) · H₂O
ⓘ	Gmelinite-Ca	9.GD.05	Ca₂(Si₈Al₄O₂₄] · 11H₂O
ⓘ	Offretite	9.GD.25	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
ⓘ	Stilbite-Ca	9.GE.10	NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O
Unclassified
ⓘ	'Apophyllite Group'	-	AB₄[Si₈O₂₂]X · 8H₂O
ⓘ	'Chabazite'	-
ⓘ	'Heulandite Subgroup'	-	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
H	ⓘ Apophyllite Group	AB₄[Si₈O₂₂]X · 8H₂O
H	ⓘ Cavansite	Ca(VO)Si₄O₁₀ · 4H₂O
H	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
H	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
H	ⓘ Opal	SiO₂ · nH₂O
H	ⓘ Pentagonite	Ca(VO)Si₄O₁₀ · 4H₂O
H	ⓘ Gmelinite-Ca	Ca₂(Si₈Al₄O₂₄] · 11H₂O
H	ⓘ Stilbite-Ca	NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O
C	Carbon
C	ⓘ Calcite	CaCO₃
O	Oxygen
O	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
O	ⓘ Apophyllite Group	AB₄[Si₈O₂₂]X · 8H₂O
O	ⓘ Calcite	CaCO₃
O	ⓘ Cavansite	Ca(VO)Si₄O₁₀ · 4H₂O
O	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
O	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
O	ⓘ Opal	SiO₂ · nH₂O
O	ⓘ Pentagonite	Ca(VO)Si₄O₁₀ · 4H₂O
O	ⓘ Gmelinite-Ca	Ca₂(Si₈Al₄O₂₄] · 11H₂O
O	ⓘ Stilbite-Ca	NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O
Na	Sodium
Na	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Na	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Na	ⓘ Stilbite-Ca	NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O
Mg	Magnesium
Mg	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
Al	Aluminium
Al	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Al	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Al	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
Al	ⓘ Gmelinite-Ca	Ca₂(Si₈Al₄O₂₄] · 11H₂O
Al	ⓘ Stilbite-Ca	NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O
Si	Silicon
Si	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Si	ⓘ Apophyllite Group	AB₄[Si₈O₂₂]X · 8H₂O
Si	ⓘ Cavansite	Ca(VO)Si₄O₁₀ · 4H₂O
Si	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Si	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
Si	ⓘ Opal	SiO₂ · nH₂O
Si	ⓘ Pentagonite	Ca(VO)Si₄O₁₀ · 4H₂O
Si	ⓘ Gmelinite-Ca	Ca₂(Si₈Al₄O₂₄] · 11H₂O
Si	ⓘ Stilbite-Ca	NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O
K	Potassium
K	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
K	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
Ca	Calcium
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Cavansite	Ca(VO)Si₄O₁₀ · 4H₂O
Ca	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Ca	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
Ca	ⓘ Pentagonite	Ca(VO)Si₄O₁₀ · 4H₂O
Ca	ⓘ Gmelinite-Ca	Ca₂(Si₈Al₄O₂₄] · 11H₂O
Ca	ⓘ Stilbite-Ca	NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O
V	Vanadium
V	ⓘ Cavansite	Ca(VO)Si₄O₁₀ · 4H₂O
V	ⓘ Pentagonite	Ca(VO)Si₄O₁₀ · 4H₂O

Other Databases

Wikipedia:	https://en.wikipedia.org/wiki/Owyhee_Dam
Wikidata ID:	Q2042735

Mindat Articles

Field Trip to Cavansite Type Locaility by Keith Wood

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

Shoofly-Olds Ferry DomainDomain
Southeast Oregon–Northern California BasinsBasin

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References

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

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Owyhee Dam, Lake Owyhee State Park, Malheur County, Oregon, USAiRegional Level TypesOwyhee DamDam Lake Owyhee State ParkState Park Malheur CountyCounty OregonState USACountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }

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Mineral List

Rock Types Recorded

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Detailed Mineral List:

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List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Other Databases

Mindat Articles

Other Regions, Features and Areas containing this locality

References

Owyhee Dam, Lake Owyhee State Park, Malheur County, Oregon, USA i
Regional Level Types
Owyhee Dam Dam
Lake Owyhee State Park State Park
Malheur County County
Oregon State
USA Country