The Tax Day Storm had a tremendous impact on north and west Harris County . Communities in Spring and Klein (Cypress Creek watershed); Cypress (Little Cypress Creek watershed); Tomball (Spring Creek and Willow Creek watersheds); Katy and Bear Creek (Addicks Reservoir watershed), and Cinco Ranch (Barker Reservoir watershed) experienced flooded homes, businesses and roads. Several neighborhoods along Cypress Creek and Little Cypress Creek also saw secondary flooding after the creeks had drained local stormwater, and additional runoff from the upper watershed reached the lower reaches of the creeks. The secondary flood primarily affected roadways, which made it difficult for traffic to flow in the area.
