creek reached by turning W at N end of bridge of Rt. Mex. 130 (ca. 1.1 roadmiles N of intersection of Rt. Mex. 130 and Rt. Mex. 180 in Poza Rica), going W for ca. 0.8 roadmiles and turning S onto farm road for ca. 0.5 roadmiles; shallow, mud, sand muscles near bank in almost no-flow water, Veracruz, Mexico