Mount Bonnell , also known as Covert Park, is a prominent point alongside the

Lake Austin Lake Austin, formerly Lake McDonald, is a water reservoir on the Colorado River in Austin, Texas. The reservoir was formed in 1939 by the construction of Tom Miller Dam by the Lower Colorado River Authority. Lake Austin is one of the seven Hi ...

portion of the

Colorado River The Colorado River ( es, Río Colorado) is one of the principal rivers (along with the Rio Grande) in the Southwestern United States and northern Mexico. The river drains an expansive, arid watershed that encompasses parts of seven U.S. s ...

Austin, Texas Austin is the capital city of the U.S. state of Texas, as well as the seat and largest city of Travis County, with portions extending into Hays and Williamson counties. Incorporated on December 27, 1839, it is the 11th-most-populous city ...

. It has been a popular tourist destination since the 1850s. The mount provides a vista for viewing the city of Austin, Lake Austin, and the surrounding hills. It was designated a

Recorded Texas Historic Landmark Recorded Texas Historic Landmark (RTHL) is a designation awarded by the Texas Historical Commission for historically and architecturally significant properties in the U.S. state of Texas. RTHL is a legal designation and the highest honor the st ...

in 1969, bearing Marker number 6473, and was listed on the

National Register of Historic Places The National Register of Historic Places (NRHP) is the United States federal government's official list of districts, sites, buildings, structures and objects deemed worthy of preservation for their historical significance or "great artistic ...

in 2015.

Geography

Mount Bonnell is located at 30.3210°N, 97.7736°W (

WGS 84 The World Geodetic System (WGS) is a standard used in cartography, geodesy, and satellite navigation including GPS. The current version, WGS 84, defines an Earth-centered, Earth-fixed coordinate system and a geodetic datum, and also descri ...

datum In the pursuit of knowledge, data (; ) is a collection of discrete values that convey information, describing quantity, quality, fact, statistics, other basic units of meaning, or simply sequences of symbols that may be further interpreted. ...

). The mount is often described as the highest point in Austin, with the elevation at its peak about 775 feet

above mean sea level Height above mean sea level is a measure of the vertical distance ( height, elevation or altitude) of a location in reference to a historic mean sea level taken as a vertical datum. In geodesy, it is formalized as '' orthometric heights''. Th ...

(AMSL). If Mount Bonnell ever held this distinction, it was only because the city limits did not include the next summit to the north, Mount Barker, which has an elevation of about 840 feet

(AMSL) But, City of Austin records indicate the city annexed for "full purpose jurisdiction" both Mt. Bonnell and Mt. Barker as part of the same parcel "on or before" 1951; Mt. Bonnell entered the city limits with its higher neighbor, Mt. Barker. Many other areas now in the city of Austin are also higher than Mount Bonnell, but few publicly accessible spots offer such a sweeping view of the downtown area.

History

Mount Bonnell's Indian Trail

A historical marker was placed at Mount Bonnell in 1969 by State Historical Survey Committee. The marker reads: Years after

Bigfoot Wallace William Alexander Anderson "Bigfoot" Wallace (April 3, 1817January 7, 1899) was a famous Texas Ranger who took part in many of the military conflicts of the Republic of Texas and the United States in the 1840s, including the Mexican–American Wa ...

's refuge in the cave on Mount Bonnell, when asked why he had chosen the cave as a refuge, he responded "Well the cave was right on the old Indian trail leading down to Austin ... and besides, the cave was in the best hunting ground for bear in all this country.."

Julia Lee Sinks

Julia L. Sinks, author and historian, was an early settler to Austin, arriving in the spring of 1840. Before meeting and marrying George Sinks, chief clerk of the Post Office Department during the Republic years, she lived on West Pecan, present day 6th street, and later wrote "Our home was on the beaten track of the Indians into town from the pass of Mount Bonnell. The knolls beyond the quarry branch were interspersed with timber, and sometimes though not often, we would see galloping past the open spaces beyond the blanketed Indian. The path along the quarry branch, secluded as it was, became their main inlet to the town. It was a sheltered road, never traveled at night by whites, so the Indians claimed right of way, and all full moons brought moccasin tracks in abundance".

Abduction of Simpson Children

If Mount Bonnell was on an Indian trail into Austin, it was also a trail out, as illustrated in another story included in Wilbarger's book, Indian Depredations of Texas. In 1842, a Mrs. Simpson living on that very same street as Julia Lee Sinks, West Pecan, about three blocks west of Congress, had two children – a daughter 14, a son 12—abducted by Indians while the children were in the adjacent "valley" (Shoal Creek). Wilbarger says that at that time there were no houses there. The Indians "seized the children, mounted their horses and made off for the mountains going in the direction of Mt. Bonnell". A posse was raised and gave pursuit. Wilbarger then says "At one time the citizens came within sight of the redskins just before reaching Mt. Bonnell, but the Indians, after arriving at the place, passed on just beyond to the top of the mountain, which being rocky, the citizens lost the trail and were never able to find where the savages went down the mountain". The Simpson girl was killed, but the boy survived and was later "traded off to some Indian traders, who returned him to his mother". It is because the boy survived and was returned home that we know what happened after the posse lost the trail of the Indians on Mount Bonnell. From Mt. Bonnell they stopped at Spicewood Springs, "which is situated in the edge of the mountains". This is where the Simpson girl was killed. Spicewood Springs is located about 5 miles north of Mount Bonnell, at the present day intersections of Mopac Expressway and Spicewood Springs Road.

Origin of the name

Mount Bonnell is generally believed to have been named after early

Texas Texas (, ; Spanish: ''Texas'', ''Tejas'') is a state in the South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2020, it is the second-largest U.S. state by ...

newspaper publisher George W. Bonnell, who moved to Texas in 1836. George W. Bonnell was publisher of the local paper ''The Texas Sentinel'' and was prominent in early Texas and

Travis County Travis County is located in south central Texas. As of the 2020 census, the population was 1,290,188. It is the fifth-most populous county in Texas. Its county seat is Austin, the capital of Texas. The county was established in 1840 and is n ...

(Austin) affairs after the War for Independence. Though sources have long credited George Bonnell as the mountain's namesake,

Albert Sidney Johnston Albert Sidney Johnston (February 2, 1803 – April 6, 1862) served as a general in three different armies: the Texian Army, the United States Army, and the Confederate States Army. He saw extensive combat during his 34-year military career, figh ...

may have named Mount Bonnell in present-day Austin for his friend and fellow West Point graduate Joseph Bonnell, who was a Captain in the Texas Army during the War for Independence. There is little contemporaneous evidence to support either derivation of the name. Legend has it that Mount Bonnell was once called Antoinette's Leap, after a young woman who leaped to her death to avoid being captured by Native Americans who had killed her fiancé.

Geology

Mt. Bonnell forms part of the

Balcones Fault The Balcones Fault or Balcones Fault Zone is an area of largely normal faulting Edwards Aquifer in the U.S. state of Texas that runs roughly from the southwest part of the state near Del Rio to the north-central region near Dallas along In ...

Escarpment An escarpment is a steep slope or long cliff that forms as a result of faulting or erosion and separates two relatively level areas having different elevations. The terms ''scarp'' and ''scarp face'' are often used interchangeably with ''esca ...

and these "balconies" were first described by Bernardo de Miranda in 1756. The lower

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of ...

Glen Rose Formation The Glen Rose Formation is a shallow marine to shoreline geological formation from the lower Cretaceous period exposed over a large area from South Central to North Central Texas. The formation is most widely known for the dinosaur footprints ...

limestone Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms w ...

outcrop An outcrop or rocky outcrop is a visible exposure of bedrock or ancient superficial deposits on the surface of the Earth. Features Outcrops do not cover the majority of the Earth's land surface because in most places the bedrock or superficia ...

s to the west of the fault zone but is buried 1000 feet to the east. A stratigraphic column starts with the

Lower Cretaceous Lower may refer to: * Lower (surname) * Lower Township, New Jersey *Lower Receiver (firearms) * Lower Wick Gloucestershire, England See also *Nizhny Nizhny (russian: Ни́жний; masculine), Nizhnyaya (; feminine), or Nizhneye (russian: Н� ...

Trinity Group overlain by the Edwards Group and the Georgetown Formation.

Upper Cretaceous The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''creta'', ...

formations follow, starting with the

Del Rio Clay The Del Rio Clay is a geologic formation in Texas. It preserves fossils dating back to the Cretaceous period. A stratigraphic column at the Mount Bonnell location starts with the Lower Cretaceous Trinity Group overlain by the Edwards Group a ...

Buda Limestone The Buda Limestone is a geological formation in the High Plains and Trans-Pecos regions of West Texas and in southern New Mexico, whose strata date back to the Late Cretaceous. Pterosaur remains are among the fossils that have been recovered ...

, and then the

Eagle Ford Group The Eagle Ford Group (also called the Eagle Ford Shale) is a sedimentary rock formation deposited during the Cenomanian and Turonian ages of the Late Cretaceous over much of the modern-day state of Texas. The Eagle Ford is predominantly c ...

. Formations within the Trinity Group include the Hammett Formation, Cow Creek Formation,

Hensel Formation The Hensel Formation or Hensel Sand is a Mesozoic geologic formation in Texas. Fossil ornithopod tracks have been reported from the formation.Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607. A stratigraphic column at the Mount Bo ...

, and Lower and Upper

. The Hammett and the lower portion of the Upper Glen Rose act as confining units (or

aquitard An aquifer is an underground layer of water-bearing, permeable rock, rock fractures, or unconsolidated materials ( gravel, sand, or silt). Groundwater from aquifers can be extracted using a water well. Aquifers vary greatly in their characte ...

) for the Middle Trinity

Aquifer An aquifer is an underground layer of water-bearing, permeable rock, rock fractures, or unconsolidated materials ( gravel, sand, or silt). Groundwater from aquifers can be extracted using a water well. Aquifers vary greatly in their characte ...

. The Upper Glen Rose contains the Upper Trinity Aquifer, which appears to have intra-aquifer

groundwater Groundwater is the water present beneath Earth's surface in rock and Pore space in soil, soil pore spaces and in the fractures of stratum, rock formations. About 30 percent of all readily available freshwater in the world is groundwater. A unit ...

flow with the Edwards Aquifer as water levels are at the same elevation. Formations within the Edwards Group include the Kainier Formation and the Person Formation. The Upper Cretaceous rock units confine the

Edwards Aquifer The Edwards Aquifer is one of the most prolific artesian aquifers in the world. Located on the eastern edge of the Edwards Plateau in the U.S. state of Texas, it is the source of drinking water for two million people, and is the primary water s ...

within the group. The Mount Bonnell fault has a vertical throw of up to 600 feet, making it the most prominent

normal fault In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic ...

within the Balcones Fault Zone. During the

Miocene The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recen ...

, the Edwards Group was displaced downwards relative to the Glen Rose Formation on the

Edwards Plateau The Edwards Plateau is a geographic region at the crossroads of Central, South, and West Texas. It is bounded by the Balcones Fault to the south and east, the Llano Uplift and the Llano Estacado to the north, and the Pecos River and Chihua ...

, so that they are juxtaposed.

Gallery

File:Mount_Bonnell_1889.jpg, Outcrop at Mount Bonnell (

Hill A hill is a landform that extends above the surrounding terrain. It often has a distinct summit. Terminology The distinction between a hill and a mountain is unclear and largely subjective, but a hill is universally considered to be not a ...

, 1889) File:Mount Bonnel Austin TX Poscard.jpg , 1917 postcard depiction of view from Mount Bonnell File:Mount bonnell.jpg, View from the summit File:Mt-Bonnell-Rock.jpg, An engraved rock at the top of Mount Bonnell File:Covert Marker on Mt Bonnell 2010.jpg, The engraved rock as it appears today File:Mt-Bonnell_1860_rs.png, Texas Historical Marker at Mount Bonnell File:Covert Park Marker at foot of Mt Bonnell.jpg, Covert Park Marker at foot of Mount Bonnell

References

External links

Early 20th century photographic postcards of Texas places at the University of Houston Digital LibraryMount Bonnell Local Community-Run Website
{{DEFAULTSORT:Bonnell, Mount Hills of Texas

Mount Bonnell Mount Bonnell , also known as Covert Park, is a prominent point alongside the Lake Austin portion of the Colorado River (Texas), Colorado River in Austin, Texas. It has been a popular tourist destination since the 1850s. The mount provides a vista ...

Geography of Austin, Texas

City of Austin Historic Landmarks Landforms of Travis County, Texas National Register of Historic Places in Texas National Park Service rustic in Texas