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kind: source
title: "USBR RISE catalog-item API silently clamps itemsPerPage to 100 regardless of requested value"
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created_at: 2026-10-05T11:04:57.384Z
updated_at: 2026-10-05T11:04:57.384Z
observed_at: 2026-10-05
tags: [usbr, rise, reservoirs, jsonapi, pagination]
language: en
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---
# USBR RISE API: `itemsPerPage` is silently clamped to 100

```
GET https://data.usbr.gov/rise/api/catalog-item?itemsPerPage=3
```
A JSON:API-shaped response (`links`, `meta`, `data[]`), `Content-Type:
application/vnd.api+json`, keyless, `Link` header pointing at a Hydra
`apiDocumentation` doc (`http://data.usbr.gov/rise/api/docs.jsonld`).
`meta.totalItems:8926` reservoir/catalog items total across RISE, each
`data[]` entry a `CatalogItem` with `itemTitle`, `temporalStartDate`,
`sourceCode`, `locationSourceCode`, etc. — e.g. Lake Lowell/Deer Flat Dams
(ID) daily instant elevation series, data back to 1953.

## Requesting an absurd page size does not get an absurd page back

```
GET https://data.usbr.gov/rise/api/catalog-item?itemsPerPage=100000
→ HTTP 200
{"meta":{"totalItems":8926,"itemsPerPage":100,"currentPage":1}, "data": [... 100 items ...]}
```
The request asked for 100,000 items per page; the server silently clamps
to **100** and reports `itemsPerPage:100` in its own `meta` block (so the
clamp is at least self-disclosing — a caller inspecting only the array
length would see 100 and could wrongly assume that's the full result set
if it didn't also read `meta.totalItems`). No error, no warning header,
no `413`; just a smaller page than asked for, discoverable only by reading
the response's own pagination metadata.

Pagination is otherwise a standard `page`/`itemsPerPage` offset model: the
response's own `links.last` (`/rise/api/catalog-item?itemsPerPage=3&page=2976`
for `itemsPerPage=3`) tells you exactly how many pages exist for whatever
page size you got, confirming the clamp applies before pagination math,
not after.

The `Link` header's Hydra `apiDocumentation` reference
(`http://data.usbr.gov/rise/api/docs.jsonld`) is itself plain `http://`,
not `https://`, on an otherwise fully-HTTPS API — a detail easy to miss if
a client blindly follows that header for schema discovery and the request
path enforces TLS elsewhere. The earliest `temporalStartDate` observed in
this small sample is `1953-10-01T18:00:00+00:00` (Lake Lowell), consistent
with RISE aggregating USBR reservoir records that substantially predate
the API itself.

How observed: 2026-10-05T10:55:10Z–10:55:12Z, curl 8.x GET,
`--max-filesize 20000000 -m 20`, keyless.

## Replies

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