Not loaded
HWM20090418
High Water Marks - March 18, 2009
Houston and Harris County publish a huge amount of open data, scattered across dozens of portals nobody tracks. This catalog lists every dataset we've found in one place, whether or not it's loaded into the explorer. Know a source we're missing? Add it, and it's shared with everyone.
| Source | What it is | Items | Loaded |
|---|---|---|---|
| Harris County ArcGIS Online services.arcgis.com |
One organization shared by county departments, precincts and staff. Mixes authoritative layers (fire stations, parks, crashes) with many working copies and one-off maps; review before use. | 3,112 | 16 |
| Rice University ArcGIS Online services.arcgis.com |
Research and class projects. Houston gems (HCFCD buyout lots, draft 2026 FEMA flood map, historical census, redlining) among worldwide student work. Research copies of agency data need permission before reuse. | 2,888 | 0 |
| Houston Advanced Research Center (HARC) ArcGIS Online services2.arcgis.com |
Environmental and regional research layers; source of the 2021 city cool-center list. | 528 | 1 |
| City of Houston GIS (ArcGIS Hubs) geohub.houstontx.gov |
Two Hub sites (Public Works geohub, citywide mycity) over several ArcGIS servers. Official. | 314 | 119 |
| Harris County Flood Control District ArcGIS Online services2.arcgis.com |
High-water marks, floodplains, projects, acreage by program. Source of the storm HWM layers. | 265 | 4 |
| City of Houston Open Data (data.houstontx.gov) data.houstontx.gov |
Separate from the GIS hubs. Mostly spreadsheets; finance (checkbook, payroll, budget) and census stay current, much else frozen since a 2023 migration. | 94 | 0 |
| U.S. Census Bureau api.census.gov |
4 | 3 | |
| FEMA (OpenFEMA and National Flood Hazard Layer) www.fema.gov |
4 | 3 | |
| U.S. Environmental Protection Agency data.epa.gov |
2 | 2 | |
| Centers for Disease Control and Prevention data.cdc.gov |
2 | 2 | |
| Texas Commission on Environmental Quality www.tceq.texas.gov |
2 | 1 | |
| Texas Water Development Board www.twdb.texas.gov |
1 | 1 | |
| U.S. Geological Survey water data waterservices.usgs.gov |
1 | 0 | |
| City of Houston 311 public data extracts www.houstontx.gov |
1 | 1 | |
| METRO (Harris County transit) www.ridemetro.org |
1 | 0 | |
| Stanford Open Policing Project openpolicing.stanford.edu |
1 | 0 | |
| TxDOT Crash Records Information System (CRIS) cris.dot.state.tx.us |
1 | 0 |
221 matches (likely staff working copies and non-Houston research layers hidden)
High Water Marks - March 18, 2009
High Water Marks - March 28, 2009
High Water Marks - October 29, 2009
High Water Marks - January 09, 2012
High Water Marks - July 12, 2012
High Water Marks - August 01, 2014
High Water Marks - October 25, 2015
High Water Marks - October 31, 2015
High Water Marks - March 10, 2016
High Water Marks - May 27, 2016
High Water Marks - January 18, 2017
High Water Marks - June 22, 2018
High Water Marks - July 04, 2018
Displays Lambert grid coverage for H-GAC region and surrounding areas. Lambert grids are used to divide aerial imagery data into uniform tiles for distribution and cataloging.
Drainage Network alignment. Little Cypress Channel Breaks for Jeremy Justice.
HCFCD LOMR & CLOMR Points
M3 HCFCD Drainage Network
M3 HCFCD FEMA Studied Streams
HCFCD M3 Project Point LOMR - CLOMR Stage
M3ProjectPointPublic
M3 Project Point Public Stage
M3 Project Point Public Stage2
M3 Project Point Public Stage2
MAAPNext Draft Results Channels
MAAPNext Modeled Channels
MAAPNext Modeled Watersheds
Watersheds to be used in the MAAPNext Draft Results Page
Oil and Gas Pipelines
FWS Gage locations that is used to generate the stream elevations service
Harris County Precinct Boundaries
Harris County Commissioner Precinct Boundary
Harris County Precinct boundaries from 2010 2021.
Harris County Precinct Boundaries voted on October 28, 2021. This selected option is Ellis Version 3.
Harris County Floodplain Reference Marks. DRAFT
Regional Watersheds for the Harris County Flood Control District.
This dataset was made to show a dissolved version of the Harris County freeways, highways, tollways, major roads based off Star*Map June 2014.
This dataset was made to show a dissolved version of the Harris County freeways, highways, tollways, major roads based off Star*Map June 2019.
SJRA & HCFCD Watershed Boundaries
SJRA Regional Watersheds
SJRA Watersheds
Mask for the Spring Creek watershed.
Portion of the Spring Creek Watershed outside the Harris County boundary.
SI Version May 21
Structure Inventory data. May 21st, 2016
Total FEMA Claims Heat Map
Found Houston or Harris County open data we don't list? A portal, a map service, a spreadsheet on an agency page, a research dataset? Tell us where it is. Reviewed suggestions are added to the catalog for everyone.