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2 UNITED STATES DEPARTMENT OF AGRICULTURE
Grande and some of the smaller tributary creek valleys. The escarpments
face west or northwest and are prominent physiographic
features.
The western half of the county is drained by the Rio Grande, and
the eastern half lies in the Nueces River drainage basin. The valley
._...,_ . e . .~ _ _of the Rio Grande
_l . . . i^ ^~ sv is deep and wide,
li r--4
r-p-; but valleys of the
-other streams
are n a r r o w and
relatively shallow,
with the uplands
~ ---'I-I I .....'
I rising gradually
-l IT ,T
' I .--\ and smoothly
I , 7^^ I-~',, , ~/' !from them, except
\ .x/ god L
"r^ 'V^;c /H for the bluffs mentioned
above. Int
e r i o r drainage.,
x.'w ays penetrate
most parts of the
county and are
dendritic in pattern.
All streams
of the area are intermittent
in flow
FIGURE 1.-Sketch map showing location of Maverick e c e p t the Rio
County, Tex. ,)
County, Tex. Grande and Las
Moras Creek, the latter being fed by springs near its source in Kinney
County.
Two large areas of very smooth upland, which are not so thoroughly
dissected as the rest of the county, occupy the north-central
part. Within these areas are several large depressions, locally called
lagunas. These lagunas represent shallow sinks or lake beds probably
caused by the solution and removal of underlying formations or
by buried faults. In rainy seasons they are covered with water.
Several similar depressions are in the Rio Grande Valley about
2 miles southeast of Quemado.
Elevations of the area above sea level range from approximately
540 feet2 at the Maverick-Webb County-line on the Rio Grande
to 956 feet 3 atop the Rio Grande-Neuces River divide at Nora. Other
known elevations are 740 feet4 at the Eagle Pass railway express
office, 825 feet at Indio primary triangulation station about 33%
miles southwest of Old Indio ranch, 778 feet on the Rio Grande at
the Maverick-Kinney County line, and 778 feet6 at the intersection
of the old road between Eagle Pass and Carrizo Springs, in Dimmit
County, and an abandoned telephone line in section 70, block 6 of
the International-Great Northern Railroad surveys.
2 United States Army topographic sheet, Texas Ford quadrangle, grid zone D.
B Elevation at top of rail, Southern Pacific Company data.
4 Bench marks, U. S. Coast and Geodetic Survey.
'Unpublished location data, main irrigation canal, Maverick County Water Control
and Improvement District No. 1, Eagle Pass, Tex.
6Bench mark, U. S. Geological Survey.