TPWD 1955 F-2-R-2 #132: Basic survey of those portions of the Brazos River bordering on or lying within Region 6-3

PROJEM‘ .Jb may 3 . 1955 Job Completion Report *‘g , by “r Richard H. Clark Assistant Project Leader TITLE Basic survey of those portions of the Brazos River bordering on or lying within Region 6-3. -- OBJECTIVES To gather fundamental data on the above waters in regard to their physical, chemical and biological aspects. METHODS The lower Brazos River, from U. S. Highway 190 to the Gulf Coast, was divided into thirteen stream sections for convenience in working the river. The locations of these stream sections are shown in Table I and on the accompanying map. The following data was recorded from at least one station within each stream section of the lower Brazos River; average width and depth; pool size; type and frequency; sechi sk readings; on types; both in the pools and on the riffles; and kinds and abundance of aquatic vegetation. A description of the surrounding country, its land use and vegetam tion, the immediate shoreline, and a river profile were also secluded. The above defined portions of the Brazos River and its tributaries were examined for evidences of pollution.’ On each occasion chemical and thermal aspects of the stream, in» cluding air and water temperatures, pH, carbon dioxide, and chlorides,were recorded. RESULTS The lower Brazos River flows south through the Post Oak Belt, which lies principally along the broad band of the Eocene extending from northeast to southwest across Texas and down across the Coastal Prairies to the Gulf of Mexico. Geologically the stream also traversesthe Pliocene, Miocene, Oligocene, and the Quaternary. These areas do not have distinct boundary lines, and there is much overlapping of physical characteristics, which makes ecological regions based on soil types difficult to define. The Post Oak Belt, to the north, is a rolling wooded plain of sand and sandy loans, much of which has been cleared for agricultural purposes. The stream has cut deep into these soils to form high vertical banks along much of its course. In places the stream bed is several hundred feet wide, and during periods of low water level, the stream may be very narrow, exposing wide expanses of sand, silt and/or gravel. The stream in other places is very shallow, flowing over most of the wide river bed. Often the fine silt found in this type association is in near solution, and has characteristics similar to ouicksand. There are also large pools of deeper water in the Post Oak Belt area, which "e heavy deposits of organic matter and silt. Bottom ooze was found occasionally, usum aily two to three feet deep, along the edges of the pools. 2. Farther south in the Coastal Prairies the soils are usually grass covered, heavy clays. Native grasses are grazed and cut for hay by ranchers, while much of the sod has been turned under to form fertile fields for cotton, corn, and rice growing. The pools are usually deeper and longer in this area and become more continuous near the Gulf Coast. .oderate to steep out banks often covered with heavy undergrowth, prevail in the Coastal Prairies, but taper off near the flat coastland. A total of 23 water analysis stations were selected on the lower Brazos River and its tributaries. These stations are shown on the enclosed map and Table I gives the low cation of each station. During the study period, the water levels fluctuated from time to time because of rains on the watershed. variations in chemical analyses might be atm tributed to these fluctuations. Table II gives an indication of the chemical aspects of the Brazos River. Water temperatures from November 195% through may 1955 ranged from 51 to 830F, with an average of 65.40F. The pH of the river ranged from 7.b to 8.8 with an average of 8.1, indicating that the soils of the watershed are alkaline. Dissolved carbon dioxide ranged from 0 to ll parts per million, averaging 3.3 parts per million. The chloride content of the river varied from 10 to 17,000 parts per million. Sea water is backed up in the river for several miles above Freeport and has been known to extend 35 to #0 miles upstream past Brazoria and East Columbia, on various occasions. During this study period, the oil and chemical industries of Brazoria and Fort Bend Coun~ ties were believed to have contributed to minor pollution of the river, but are not believed to have damaged the ecology of the river to any great extent. Dow Chemical Company, near Velasco, is known to be spending thousands of dollars each year for the control of waste materials produced by their plants. The turbidity of the stream, as recorded in Table II by sechi disk readings in inches, tries from 3 to 20 inches in depth, and averages 7.7 inches. The highly erodable soils ,f the watershed contribute greatly to the turbidity of the stream, as do the large amounts of decaying organic matter of plant origin that is washed in by floods and rises. The Brazos River valley, within the boundaries of Region 6uB, has a normal annual precipitation rate of from 30 to #0 inches, and often receives over #0 inches near the coast. Stream flow data provided by the U. 8. Geological Survey shows that the average ans nual discharge at Bryan, Hempstead and Richmond, over a 10 year period from 19h5 to l95h, was 3,539; 5,hOl and 5,571 cubic feet per second respectively. The Navasota River flows ing into the Brazos River below Bryan contributes some to the higher rate of discharge reported at Hempstead and Richmond. The maximum discharge rate of 42,860 second feet was recorded in April, lth, at Hempstead. The minimum discharge of lll second feet was recorded at Bryan in October, 1953. Fluctuations in stream flow of the Brazos are due to several major factors. Besides rainfall, the river fluctuates as water is released from Lake Whitney for production of power, and for irrigation. In the spring, during the rice growing season, large quantiw ties of water are pumped from the river for the irrigation of the rice crops. This, of course, causes a very irregular flow in the river. The fact that submerged aquatic vegetation on the Brazos is very limited, may be attributed to the extreme turbidity of the stream as well as to the variation of stream flow. Bluemgreen algae were noted on a very few occasions, and sedges were noted high on the bank in an area near Hearne. Willows, Salim nigra, were found to be relatively abundant along the course_of the river. Timber along the banks represents a wide variety, eluding pecan, post oak, live oak, ash, cotton wood, elm, walnut, hickory, sycamore and various shrubs. 3. Table ill contains a checklist of fishes that are known to occur in the previously defined portion of the lower Brazos River. ‘UMMARY l. The lower Brazos River flows in a Southeasterly direction, down through the over» lapping ecology of the Post Oak Belt, and the Coastal Prairies, and empties in the Gulf of Mexico. 2. A variety of agricultural crops are grown along the lower Brazos, which include cotton, corn, rice and grass and legumes for cattle grazing and hay. 3. Twenty-three water analysis stations were selected on the Brazos River, but study revealed no evidence of major pollution during this segment period. t. Due to the highly erodable soils, and large amounts of decaying organic matter that are washed into the stream by the area‘s relatively high rainfall, the Brazos is extremely turbid. 5. Discharge fluctuations along the Brazos River are caused by water being released from Lake Whitney for power production and irrigation, consequent pumping of the water from the river, and by rainfall. 6. Submerged aquatic vegetation is limited to bluemgreen algae, which is unable to propagate its self successfully under conditions of high turbidity, and fluctuating water levels. 7. A checklist of fishes known to occur in the lower Brazos River is included in this report. ' Table I Key to water Analysis Stations on the Lower Brazos River and its Tributaries. Station number Location 1. Brazos River, at crossing of U. S Highway 190, west of Hearse. 2. Brazos River, at crossing of U S. Highway 79, southwest of Hearne. 3. Brazos River, at crossing of State Highway 21, southwest of Bryan. h. Brazos River, at crossing of Farm Road 60, southwest of College 6a. 6b. 6c. 6d. 6e. 6f. 11b. llc. 11d. 12a. 12b. 120. 13. Station. Brazos River, at crossing of farm road, southwest of Welborn. Brazos River, at Washington State Park, washington. Brazos River, five miles upstream from Washington, off Farm Road 159. Navasota River, twelve miles southeast of College Station, off State Highway 6. Navasota River, at crossing of State Highway 6, two miles north of Navasota. Navasota River, at crossing of State Highway 90, west of Navasota. Navasota River, at confluence of Brazos River, near washington. Brazos River, at crossing of U. S. Highway 290, west of Hempstead. Brazos stead. Brazos Brazos Brazos County. Brazos Brazos Brazos County. Brazos Brazos Brazos Brazos River, River, River, River, River, River, River, River, River, River, River, at crossing of State Highway 159, southwest of Hempm at San Felipe State Park, east of Sealy. at crossing of Farm Road 723, north of Rosenberg. four miles northeast of Crabb, Benson Farm, Fort Bend at the Santa Anita Ranch, Fort Bend County. at the Agnes Booth Farm, Fort Bend County. at South Texas water Co., near Juliff, Fort Bend at the J. E. Fairfield Ranch, Brazoria County. at crossing of State Highway 35, East Columbia. at crossing of Farm Road 521, near Brazoria. at crossing of State Highway 36, near Freeport. .oamaom sorrow q .oamfiem ooemnsm W .momfio so sobfiow nowpom m.momwo so soawow ooemoom .omfia no ooewm .oamssm soppom .onEem oooaoom .onEom soppom .onssm oosmosm .Hosofl hopes moweooom .Ho>oH nope: mofieooom m M l _ fl _ m m .Ho>oa amps? msfloooom _ l mMooEom OH NFODWUNKOWKDOO r—Ir-“i Pfijfid‘fi t—‘I H4000! H r-I.i mmogosflv Mafia anoom S i i ma l: i 3 3mm moeaaoago m m a m a m a m m a m m HH 3 a m e um...“ H m m H m m m m m m m m m m m m o o a a m amm mewsoflm sonaoo \\ m.s s.w m6 msw m6 es. .1. as. mgm .: i1. a.w as so. 9m m.m me mgm as s.w so to es m.s we. m.w w.m m.m e.m s.m :.w fim w.w e.w Wm m.» was mm .QEoB oopez ho .anH had .mmmH meg Smooaflw emma aopaoeoz .momhasoa Mono: harem moaoam oozed HH oasad spam sowpoom Seesaw Table III Checklist of Fishes found to Occur in the Lower Brazos River. Scientific Name Scoliodon terrae-novae Lepisosteus spatula Lepisosteus platostomus Lepisosteus productus Elops saurus Tarpon atlanticus Brewoortia gunteri Dorosoma petenensis Dorosoma cepedianum Anchoa mitchilli Cycleptus elongatus Ictiobus bubalus Carpiodes carpio Cyprinus carpio OESOpoeodus emiliae Hybopsis aestivalus Eotropis atherinoides Egtropis oxyrhynchus Notropis brazosensis Notropis potteri Notropis lntrensis Eimephales vigilax Ictaluras punctatus Ictalnras furcatus Eilodictns olivaris Bagre marina Galeichthys felis Canonsia_affinis Aphredonderus ggyanus Eggil_cephalus Morons chrysops Chaenobryttus coronarius Lepomis cyanellus iepomis macrochirus Lepomis humilis Lepomis megalotis PomoXis annularis Aplodintgi’grunniens Leiostomus Kanthurns Micropogan undulatus Cynoscionhnebulosns fagodon rhomhoides Urophysis floridanus Fondulus grandis Common Name Sharpness shark Alligator gar shortnose gar spotted gar bigeye herring tarpon bay menhaden threadfin shad gizzard shad bay anchovy bluesucker smallmouth buffalo river carpsucker carp pugnose minnow speckled dace emerald shiner sharpness shiner Brazos River Shiner broadhead Shiner red Shiner parrot minnow channel catfish blue catfish yellow catfish gafftopsail catfish sea catfish common mosquitofish pirate perch striped mullet white bass warmouth bass green sunfish bluegill sunfish orangespotted sunfish longear sunfish white crappie freshwater drum spot Atlantic croaker spotted squeteagne pinfish hake _ large killifish ‘ LOWER BRAZOS RIVER VALLEY stststst I ”M L ' ML 1'1 ....... O M: 'H .VELSC-O ' f I+ will it. " - 4: t 00‘ q, < 69.1- 9 . COLyMBIAt. @9300 1]. h a . l . iii A “Elli-mu {limit WI"! “1'?""fmfflfi _ "-"l"llllibiaz'liur“maWWW "v": This page should be attached to Job Completion Report by Richard a. Clark, Assistant Project Leader, Project No. Fm2wa2, Jon A~5, in order to make the following corrections. Page 2, Paragraph h. The chloride content of the river varied from lOO (not 10) to 17,000 parts per million. Table II, Column 7. Chlorides ppm 160 1&0 1A0 150 140 1&0 110 100 110 110 110 330 170 390 190 130 310 1&0 220 190 200 200 300 210 1380 280 120 120 200 130 130 7000 15350 8050 13050 13650 , 17000