Help for the Ice Jam Database Application
Blue Tabs (upper right)
The Ice Jam Database is maintained by the Ice Engineering Group at CRREL and currently consists of approximately 15,000 records from across the US. The Ice Jam Database application contains several tools for accessing information about both historic and current ice jams, and relate information about the processes involved in the formation of an ice jam. The
documentation below provides help for using the tools in this application. The information is organized by major tab groups within the application.
Latitude and longitude
values for jam events are based on descriptions in references sources, USGS
gaging stations, or city of occurrence and are subject to the accuracy of GPS
measurements, interpolation from topographic or and other maps, and age of
records. Further detailed information regarding location may be available in the
Preliminary entries are
available to provide data regarding recent reports of events. This information
is gathered from various official sources, media and local observations. Much
of this information is considered provisional, has received limited review and
has not received final approval.
Red Tabs (upper left)
The "Home" tab contains general information about the CRREL Ice Engineering Group and the Ice Jam Database, Bulletins and Surveys. The following links are provided:
- Flood Conditions and Flood Outlook: Links to reports on current flooding conditions, hydrologic outlooks and water data reports.
- Ice and Snow Maps/Products: Ice and snow information including ice maps, river ice thickness measurements and snow maps, surveys and reports.
- Related Links: Links to Corps of Engineers offices and NOAA/National Weather Service river forecast centers.
- Technical Resources: Reports and presentations related to various aspects of ice jams and related flooding.
- Web Camera Images: Near real-time Images of CRREL research sites related to ice jams and flooding.
The "Text Query" tool provides information about current and historic ice jams from the Ice Jam Database. Query results are based on selections made within the Text Query section, including location, date, and content criteria. List below are key points for creating text queries (left side of page):
Map View and Query
- To refine the query results make selections using any combination of the options provided. The data selected from the query will be those records meet ALL criteria selected in the text query.
- Not all state, cities and rivers are listed in the pull-down lists. Only those that have at least one record in the ice jam database are listed.
- Query Results (right side of page) are listed in descending, chronological order.
- To select only records with visuals (graphics, pictures), check the 'Visuals Only' checkbox.
- To select only records with reports check the "Reports Only" checkbox.
- To print the results of a text query, click on the "Show Pintable Version" button in the upper right corner of results
- To create and output a spreadsheet of the results of a text query, click the "Export Report" button.
The "Map View and Query" tab provides a mechanism for querying the Ice Jam Database using an interactive map. The map interface also includes map utilities for measuring area and distance, and creating a pre-formatted printable map of the selected map view. The following list provides details on map viewing and associated utilites:
Data Layer Selection
- To view a data layer place a check mark in the layer's checkbox.
- To view available layers within layer groups, click the down arrow next to each layer group.
- Layers that are grayed out are not viewable at the current scale. Use the Zoom In tool to zoom to a scale large enough for the
data to be viewable.
- Click the Legend tab to see a description of the map symbols.
- For the name of each Map Navigation tool, move the cursor over the tool without clicking on the tool.
- Zoom In - Define a zoom area by moving your mouse over the map, holding down the left mouse button, and dragging the red box.
When you release the mouse button, the map will zoom to the area inside the box. Alternatively, you can click on the map to zoom in.
The map will zoom and recenter on the location of the mouse click. Zoom out using the Zoom
- Zoom Out - Click on the map to recenter on that location and zoom out by a factor of two.
- Pan - Hold down the left mouse button and drag to move the map to a new location without changing scale.
- Previous Extent - Click this icon to return to the previous location and scale.
- Full Extent - Returns map to original extent.
- Map Size - Click small, medium or large square to change map size on page.
- Identify Map Feature - clicking this utility activates the Utilities tab. Select a queryable layer from the pull-down list and click on the map
to identify the nearest layer record to the selected point on the map. The information will be displayed under the Layer pull-down list.
(Queryable layers are identified by a (Q) after the layer name.
- Measure Distance - Use this tool to measure distance by clicking to create segments of a line. Measurement is given in current segment distance and total distance.
- Measure Area - Use the curor to create a polygon. Measurement is given in total area.
- Printable Map - click the printer icon to create a map for the current displayed map. A text box for Map Title is displayed in Utilities. Clicking the 'Create
Map' opens a new window with the map as it will print. Click the 'Print' button to print the map.
- Go To Location - The Go To utility provides search and zoom capabilities by geographic entity.
Return to Clearinghouse
Clicking on this link sends the user to the CRREL Ice Jam Information Clearinghouse. From this site the user can return to the
Ice Jam database by either clicking on the BACK button, or cliking the "Query the Ice Jam Database" link on the Ice Jam information Clearinghouse home page.
The Terminology page provides definitions of ice terminology, published by the Research Centre for Water Resources Budapest (1980).
Historical ice jam data reports, summarized by various categories. Click on a summary report on the left side of the page and the appropriate summary content will be shown on the left side of the page.
This Help document.
A form is provide to fill in subject, name, telephone, e-mail and a message. The message can be sent to the Ice Jam Database proponent or manager.