Photo: Joseph Mischyshyn · CC BY-SA 2.070% of Shannonbridge’s homes stand low beside the River Shannon, more than in 96% of Irish towns
Shannonbridge has no Hazard risk Grade: Irish places under 1,000 residents aren’t graded. The figures below are still its own.
What stands out about Shannonbridge’s hazards
From the EPA’s radon map, Geological Survey Ireland’s landslide map, the OPW’s flood relief schemes and our estimate of low-lying homes, below.
What Shannonbridge faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Low-lying homes
Radon
Landslides
Ground heights
Shannonbridge has no Hazard risk Grade
Each figure is placed among Irish towns as the grade would place it, without a letter.
Less sure: The low-lying figure is our estimate from ground heights and the river map, not an official flood map. It can show a town is low-lying; it can’t show a town is safe. A small place (138 homes): a few houses move the figure a lot.
70% of Shannonbridge’s homes stand low beside the River Shannon
Low-lying homes, a TownRatings estimate from OPW and Geological Survey Ireland LiDAR ground heights and the EPA’s river map: not an official flood map.
Share of each town’s homes standing low by big water, for the towns measured in detail. 43% have none; Shannonbridge has more than 96% of them.
Low-lying homes across County Offaly’s towns · 4 towns measured in detail
Homes: OpenStreetMap buildings of 30 m² or more, not tagged as non-residential, in the town’s Census 2022 Small Areas. Heights: GSI Open Topographic Data LiDAR (OPW, TII and GSI surveys). Water: EPA river network (rivers of Strahler order 5 or more), lakes, estuaries and coastal waters.
The River Shannon at Shannonbridge peaked at 5.56 m in January 2016
Each winter’s highest level (October to September) at the OPW’s Shannonbridge gauge, in Shannonbridge, since 1983, in metres above the gauge’s zero. Nine days in ten it runs between 2.18 m and 4.58 m.
- 5 January 20165.56 m
- 27 November 20095.54 m
- 28 December 20155.39 m
- 14 December 20155.39 m
- 13 January 20165.30 m
- 2 March 20205.21 m
Since 1983 the River Shannon has run above its usual top on 811 days, most of them in the winters of 2015–16 and 2013–14.
Measured by its highest day, last winter (2025–26) was the 14th-highest of the 42 on record here.
Source: OPW Hydro-Data (waterlevel.ie/hydro-data), Shannonbridge gauge (station 26028): daily maximum and mean levels, inspected and provisional data. The usual range is the 5th to 95th percentile of daily means, worked out by TownRatings. Live levels are on waterlevel.ie.
Weather and flood warnings for Shannonbridge
Where to see the warnings in force, and what this page can’t count.
Met Éireann issues yellow, orange and red warnings for rain, wind and coastal flooding county by county; Shannonbridge is covered by County Offaly’s.
| Warning | What Met Éireann means by it |
|---|---|
| Yellow | Weather that isn’t unusual but can be dangerous in places: be aware. |
| Orange | Infrequent, dangerous weather that can put people and property at risk: be prepared. |
| Red | Rare, extremely dangerous weather: take action to protect yourself and your property. |
Met Éireann doesn’t publish an open archive of past warnings, so how often warnings have covered Shannonbridge can’t be counted here.
No OPW flood relief scheme protects Shannonbridge
The Office of Public Works’ completed flood relief schemes and the areas each one benefits (OPW open data, CC BY 4.0).
None of the OPW’s completed flood relief schemes has a benefiting area that takes in Shannonbridge’s homes. The OPW builds schemes where the risk to homes is greatest, so most towns have none.
In County Offaly, an OPW scheme also protects part of Tullamore.
| Town | Scheme | Designed for | Homes behind it | Away |
|---|---|---|---|---|
| Ballinasloe Galway | Ballinasloe (Derrymullen) Flood Relief Scheme | 1 in 100 | 3.2% | 13 km |
| Tullamore Offaly | Tullamore Flood Relief Scheme | 1 in 100 | 2.4% | 36 km |
| Mullingar Westmeath | Mullingar Flood Relief Scheme | 1 in 100 | 0.2% | 53 km |
| Gort Galway | Gort River (Bridge Street) Drainage Scheme | 1 in 100 | 0.9% | 57 km |
| Baile Chláir Galway | Clare River (Claregalway) Flood Relief Scheme | 1 in 100 | 7.9% | 60 km |
| Annacotty Limerick | Mulkear River (Ballymackeogh) Flood Relief Scheme | 1 in 10 | 1.1% | 76 km |
No home in Shannonbridge stands on landslide-prone ground
Geological Survey Ireland’s landslide susceptibility map (1:50,000), read at every home.
Homes on ground rated high or moderately high
Shannonbridge is among the 64% of Irish towns with no home on such ground.
GSI rates ground from low to high by its slope, soil and rock. Most Irish landslides are on steep upland slopes and peat after heavy rain; a town on flat ground has almost none.
High means the ground could slide under the right conditions, such as days of heavy rain on a steep, wet slope; it isn’t a forecast that it will.
GSI landslide susceptibility, high and moderately high classes, share of the town’s homes on mapped ground (CC BY 4.0).
An estimated 13% of Shannonbridge’s homes are above the radon reference level
The EPA’s radon map: for each 10 km square, the estimated share of homes above the national reference level of 200 Bq/m³.
A square where 10% or more of homes are estimated above the reference level is a High Radon Area; 100% of Shannonbridge’s homes are in one. The map is an estimate by area: two neighbouring houses can differ a lot.
A test is the only way to know a home’s level: two detectors, left for three months in a living room and a bedroom.
EPA radon map of Ireland (10 km grid), averaged over the town’s homes (CC BY 4.0).
3 EPA-licensed sites within 5 km of Shannonbridge’s centre, none inside it
Factories, farms, power plants and waste sites that hold an EPA licence for their emissions, in Shannonbridge and around its centre.
| Site | Licence and activity | Away |
|---|---|---|
| Shannonbridge TEG | Industrial Emissions licence · energy | 0.5 km |
| Electricity Supply Board (West Offaly Power) | Industrial Emissions licence · energy | 0.6 km |
| Bord na Móna Energy Limited (Blackwater) | IPC licence | 2.6 km |
| Activity | Sites |
|---|---|
| Energy | 2 |
| Not classed in the register | 1 |
Within 5 km: 2 under Industrial Emissions licences and one under an older IPC licence.
An EPA licence sets what a site may release to air, water and land; it doesn’t mark the site as an accident hazard.
Sites holding dangerous substances in bulk come under the COMAH (Seveso) rules, but the HSA’s list of them has no open licence, so upper- and lower-tier sites aren’t counted here.
Source: EPA registers of Industrial Emissions, IPC and waste licences, sites licensed on 31 October 2026; distances in a straight line from the town’s centre.
Hazards in the places around Shannonbridge
Low-lying homes, radon and landslide ground, town by town.
| Town | Low-lying | Radon | Landslides |
|---|---|---|---|
| Shannonbridge | 70% | 13% | 0% |
| Banagher 1,907 · 11 km | – | 0.2% | 0% |
| Ballinasloe 6,597 · 13 km | 24% | 2.6% | 0% |
| Ferbane 1,324 · 14 km | – | 0% | 0% |
| Athlone 22,869 · 18 km | 22% | 1.6% | 0% |
Shannonbridge has more of its homes standing low by big water than any measured place around it; the next is Ballinasloe (24%).
A dash under Low-lying: not measured there (too few homes with detailed ground heights), not none.
Get ready for what Shannonbridge faces
What to do, and what to ask before you move.
- Never walk or drive through floodwater: 30 cm of moving water can float a car.
- Move valuables, papers and medicines upstairs.
- Turn off gas, electricity and water if you’re told to.
- Test over three months, in a living room and a bedroom.
- Above 200 Bq/m³, a small sump and fan usually fixes it.
- The EPA sells radon test kits at radon.ie and lists registered contractors who fix high readings.
- Bring in or tie down bins, trampolines and anything the wind can lift.
- Keep away from coastal paths and piers while an orange or red warning is in force.
- Charge phones and keep a torch: fallen lines are the commonest storm damage.
- After the storm, report a fallen line to ESB Networks and keep well clear of it.
- Ask whether the home has ever flooded, and get a buildings insurance quote before you commit: flood cover isn’t always offered.
- Ask the seller or landlord for a radon test result, or test in your first months there.
- Check the address on floodinfo.ie: the OPW’s flood maps and its record of past floods.
What this data can and can’t tell you
- An estimate, not a flood map. Low-lying homes is a TownRatings modelling step: each home’s ground height from LiDAR, against the level of the nearest big river (Strahler order 5 or more), lake or estuary within 1 km, or the sea within 2 km. A home within 5 m of the water’s level, or below 4 m near the sea, counts.
- Flood counts only one way. A high share of low-lying homes lowers the Hazard risk Grade; a low share never raises it, because defences, small streams, culverts, groundwater and flash floods don’t show in ground heights. Below the national median a town scores as the median.
- Defences aren’t counted. Flood defences aren’t taken off: the OPW scheme that protects the most homes is shown instead, with its design standard.
- Measured where the heights are detailed. A town is measured, and counted, only where 80% of its homes stand on LiDAR heights. Elsewhere the page says flooding isn’t measured, never that the town is dry.
- Radon is an estimate by area. The EPA’s radon map gives the estimated share of homes above 200 Bq/m³ for each 10 km square, averaged here over the town’s homes. It says where to test, not what one house holds.
- The sea is measured by height. Homes count as low by the sea when their ground is under 4 m and within 2 km of coastal or estuary water; waves, surges and erosion aren’t modelled.
- Landslide ground is a map of where slides could start. GSI’s susceptibility map rates the ground itself; it doesn’t record past slides or say when one will happen.
- Bathing water is rated season by season. The EPA classes each identified bathing water from four seasons of samples; a rating says how clean the water has been, not how safe it is to swim.
- One town, many streets. Risk is street by street. Check a specific address on floodinfo.ie before you buy or rent.
Check any address against the OPW’s official flood maps on floodinfo.ie
Questions about flooding and hazards in Shannonbridge
Does Shannonbridge flood?
About 70% of Shannonbridge’s homes stand low beside the River Shannon: a higher share than in 96% of Irish towns. That is our estimate from ground heights, not an official flood map. For a single address, the OPW’s official flood maps and past floods are on floodinfo.ie.
Is radon a problem in Shannonbridge?
The EPA’s map estimates that about 13% of homes around Shannonbridge are above the radon reference level of 200 Bq/m³: a higher share than in 84% of Irish towns. 100% of its homes are in a High Radon Area. The only way to know a house is a three-month test.
Is Shannonbridge at risk of landslides?
No home in Shannonbridge stands on ground rated high or moderately high for landslides.
Is Shannonbridge at risk from the sea?
None of Shannonbridge’s homes stands below 4 m within 2 km of the sea, so the sea plays no part in its share of low-lying homes; 70% stand low by rivers, lakes and estuaries.
How does Shannonbridge compare with the places around it?
Radon estimates around Shannonbridge run from 0% in Ferbane to 2.6% in Ballinasloe; Shannonbridge’s own is 13%. Among the places measured in detail, Ballinasloe has the largest share of homes standing low (24%).
Flood: TownRatings’ estimate from ground heights, not an official flood map. Contains Irish Public Sector Data (Geological Survey Ireland, the Office of Public Works and the EPA) licensed under CC BY 4.0; Copernicus DEM © DLR e.V. and © Airbus, provided under COPERNICUS by the EU and ESA; © OpenStreetMap contributors. Radon and bathing water: EPA (CC BY 4.0). Landslide susceptibility: Geological Survey Ireland (CC BY 4.0).
Sources: low-lying homes: TownRatings’ estimate from GSI and OPW LiDAR, Copernicus GLO-30 and the EPA river network · radon: EPA radon map · landslides: GSI landslide susceptibility · river levels: OPW Hydro-Data (waterlevel.ie/hydro-data) · industrial sites: EPA licence registers. Under Creative Commons Attribution 4.0 (CC BY 4.0).
Contains Central Statistics Office (CSO) data, Census 2022, and Tailte Éireann boundaries (CSO Urban Areas, Small Areas, local electoral areas, constituencies), under Creative Commons Attribution 4.0 (CC BY 4.0).