This Texas DOT project was to improve the SH 349 Reliever Route by constructing a new road alignment, new Jal Draw channel alignment, a culvert at CR 60, a bridge at the new SH 349, and new culverts at FM 1788. HHR provided hydrologic analysis and hydraulic modeling for all drainage improvements, prepared the drainage study and report, and created documentation for the FEMA CLOMR application. This project was complicated by these factors: (1) floodway encroachments on the FIRM did not match effective model; (2) a previous LOMR revised hydrology for the watershed, but the resulting changes were not mapped; (3) some structures were omitted from the effective model; and (4) floodway encroachments required revision. The revised conditions model included channelization, a new bridge crossing, a new culvert crossing (skewed), replacement culverts, and revised floodway encroachments. We coordinated this effort with the local floodplain administrator, FEMA, and TxDOT.