20220421 14010500 1.0 TRUE SGA Phase 1 Assessed Reaches The stream geomorphic assessment (SGA) is a physical assessment competed by geomorphologists to determine the condition and sensitivity of a stream. The Phase 1 SGA is the remote sensing first phase that gets completed largely in an office setting. The SGA Phase 1 Assessed Reaches indicates where the SGA Phase 1 has been completed in Vermont.